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Show Your Vintage MTB Drop Bar Conversions

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Show Your Vintage MTB Drop Bar Conversions

Old 06-24-16, 04:41 PM
  #5001  
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Here's my lasted MTB/Dropbar Frankenbike.

Plus, there's now a new use for those old Suicide Brake Levers.

The SUMMIT MTB bicycle was given to me because the shifters were busted, the rear derailler cable housing stop was missing and the crank barely turned.

I used a barrel adjuster from a rear derailler and clamped the adjuster with a hose clamp to the chainstay so that the adjuster acts as the cable housing stop.

I didn't want the expense of buying eith barend shifters or integrated brake lever shifters for the dropbar I wanted to use. The dropbar came off another old bike and it had brake levers with the auxiliary suicide levers. Inspiration struck!

I removed the suicide levers and file a flat on opposite sides of the stb sticking out from the brake lever body. This stud is actually the brake lever pivot. The flats were file so thatt hey accept the rectangular slot inthe sghifter innards. Once the flats were file I simply mounted the shifters onto the brake pivot stud and used the original suicide lever retaining bolt to keep the shifter in place. The shifter cable feeds into shifter cable housing that is tightly taped to the dropbar and then covered with bar tape.

The shifter is very easy to use with a thum or finger and shifts very well.

Here are some images.

Bike.

! SUMMIT MTB 2 Dropbar 01 by Miele Man, on Flickr

! SUMMIT MTB 2 Dropbar 02 by Miele Man, on Flickr

! SUMMIT MTB 2 Dropbar 03 by Miele Man, on Flickr

The Brake Body mounted rear shifter.

Brake Lever Mounted Shifter 01 by Miele Man, on Flickr

Brake Lever Mounted Shifter 02 by Miele Man, on Flickr

Brake Lever Mounted Shifter 03 by Miele Man, on Flickr

Brake Lever Mounted Shifter 04 by Miele Man, on Flickr

The Shifter in use.

Brake Lever Mounted Shifter Operation 01 by Miele Man, on Flickr

Brake Lever Mounted Shifter Operation 02 by Miele Man, on Flickr

Brake Lever Mounted Shifter Operation 03 by Miele Man, on Flickr

So, now it's possible to convert an MTB to a dropbar bicycle even if you don't have barend or integrated brake/shifters. Plus it's a great use for those old suicide brake levers.

Cheers
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Old 06-24-16, 06:28 PM
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Originally Posted by Miele Man
Here's my lasted MTB/Dropbar Frankenbike.

Plus, there's now a new use for those old Suicide Brake Levers.

The SUMMIT MTB bicycle was given to me because the shifters were busted, the rear derailler cable housing stop was missing and the crank barely turned.

I used a barrel adjuster from a rear derailler and clamped the adjuster with a hose clamp to the chainstay so that the adjuster acts as the cable housing stop.

I didn't want the expense of buying eith barend shifters or integrated brake lever shifters for the dropbar I wanted to use. The dropbar came off another old bike and it had brake levers with the auxiliary suicide levers. Inspiration struck!

I removed the suicide levers and file a flat on opposite sides of the stb sticking out from the brake lever body. This stud is actually the brake lever pivot. The flats were file so thatt hey accept the rectangular slot inthe sghifter innards. Once the flats were file I simply mounted the shifters onto the brake pivot stud and used the original suicide lever retaining bolt to keep the shifter in place. The shifter cable feeds into shifter cable housing that is tightly taped to the dropbar and then covered with bar tape.

The shifter is very easy to use with a thum or finger and shifts very well.

So, now it's possible to convert an MTB to a dropbar bicycle even if you don't have barend or integrated brake/shifters. Plus it's a great use for those old suicide brake levers.

Cheers
Ingenious! Nicely done!
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Old 06-24-16, 07:14 PM
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Miele Man, Howdy;

Very interesting solution to the shifter befuddlement.
Leads me to a question. As someone new to bike -n- steining,
are the actual shift levers themselves from the old Suicide Brakes
or are the levers from one of those shifters that attach to the tube
that runs from the head tube to the BB or attaches to the stem?
Thanks again for the new way to do something.

hank
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Old 06-24-16, 07:37 PM
  #5004  
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Originally Posted by hankaye
Miele Man, Howdy;

Very interesting solution to the shifter befuddlement.
Leads me to a question. As someone new to bike -n- steining,
are the actual shift levers themselves from the old Suicide Brakes
or are the levers from one of those shifters that attach to the tube
that runs from the head tube to the BB or attaches to the stem?
Thanks again for the new way to do something.

hank
Hi.

The shift levers I used are old Shimano downtube ones. You can use just about any shifter though including stem mount ones. I just removed the extra brake lever that was mounted on the side of the brake lever body and then i modified that brake lever pivot to accept the innards of the shifter. I think it took about 5 minutes to file the two flats on the right brake leber pivot and even less to do the left one.

Here's a site that shows brake levers similar to the ones I used.

Hugh`s bicycle blog: Suicide Levers! We don`t need no STINKING Suicide Levers!

The first image shows him removing the auxilary brake lever.

The second image shows him cutting off the section of the pivot that extends out past the brake lever body and that the auxiliary brake lever fits over and is bolted to. That extension is the part I made 2 flats on and then mounted the shifter on.

If i can get another suicide brake lever soon I'll do a step by step of the converting.

Cheers
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Old 06-25-16, 12:54 AM
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Miele Man - Nice job with your bike. I like what you did with it. I don't think its a Summit brand bike though. Someone just stuck on a sticker from Summit Racing, https://www.summitracing.com/
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Old 06-25-16, 08:01 AM
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Miele Man, Howdy;

Thanks for the further explanation. Looking forward to seeing your SBS
of the how to. I'm more a 'visual' learner and the link was helpful as well.

Cheers,

hank
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Old 06-25-16, 08:41 PM
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Originally Posted by vdub6541
Black, and even has a cantilever stop so I can get rid of the cheap sunlite hanger! Win win. Got the stem and a RaceFace DeusXC crank for a total of $15!
I personally think that's one of the worst blunders in bicycle design, ever. Putting the brake cable stop inside the stem means you can't raise or lower your handlebars without also having to redo your front brake. Stupid. I always throw those stems away, and use either the cheap Sunlite hanger (which works fine, and even has an adjusting barrel and comes in either black or silver), or the Tektro fork-mounted stop.

In addition, if you're going to get front brake shudder, it's going to come from having the stop way up there and all that cable length. Having the stop fork-mounted, either at the top (part of the headset stack) or at the crown, provides much better braking.
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Old 06-26-16, 12:29 AM
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Originally Posted by Jeff Neese
I personally think that's one of the worst blunders in bicycle design, ever. Putting the brake cable stop inside the stem means you can't raise or lower your handlebars without also having to redo your front brake. Stupid. I always throw those stems away, and use either the cheap Sunlite hanger (which works fine, and even has an adjusting barrel and comes in either black or silver), or the Tektro fork-mounted stop.

In addition, if you're going to get front brake shudder, it's going to come from having the stop way up there and all that cable length. Having the stop fork-mounted, either at the top (part of the headset stack) or at the crown, provides much better braking.
I wonder how many of those stems with the cable housing stop built into them have an inherent stress riser or broke in use.

I agree that an external cable hanger is a lot better if you ever decide to adjust the height of the stem.

Cheers
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Old 06-26-16, 07:46 PM
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Hey Miele Man-
Mr. Creosote called it... Summit Racing is it's own thing and they include stickers with every order. What you built up is an American made Cannondale SMxxx from the early 1990's. The oversized aluminum isn't a dead giveaway as there were a few brands using the OS aluminum. The unique attribute on your frame is the extended axle. I had one from that era, sorry no photos. Google 1991 Cannondale SM800 and you'll see what I'm talking about.

Enjoy the bike for many miles
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Old 06-26-16, 09:51 PM
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Originally Posted by Miele Man
I wonder how many of those stems with the cable housing stop built into them have an inherent stress riser or broke in use.

I agree that an external cable hanger is a lot better if you ever decide to adjust the height of the stem.

Cheers
I've been at it since 1976 and have never seen one. Got a box full of old MTB stems with holes and none are cracked.
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Old 06-26-16, 10:26 PM
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Originally Posted by Jeff Neese
I personally think that's one of the worst blunders in bicycle design, ever. Putting the brake cable stop inside the stem means you can't raise or lower your handlebars without also having to redo your front brake. Stupid. I always throw those stems away, and use either the cheap Sunlite hanger (which works fine, and even has an adjusting barrel and comes in either black or silver), or the Tektro fork-mounted stop.

In addition, if you're going to get front brake shudder, it's going to come from having the stop way up there and all that cable length. Having the stop fork-mounted, either at the top (part of the headset stack) or at the crown, provides much better braking.
I hadn't considered that. Conveniently, I'm not using the stem anymore since I had issues getting my bars through it.

Originally Posted by Miele Man
I wonder how many of those stems with the cable housing stop built into them have an inherent stress riser or broke in use.

I agree that an external cable hanger is a lot better if you ever decide to adjust the height of the stem.

Cheers
I like the tektro fork mounted one. The one I have now (sunlite) has a barrel adjuster, but it's really cheaply made and gets stuck easily. Minor annoyance, but still noteworthy
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Old 06-26-16, 10:42 PM
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Originally Posted by neo_pop_71
Hey Miele Man-
Mr. Creosote called it... Summit Racing is it's own thing and they include stickers with every order. What you built up is an American made Cannondale SMxxx from the early 1990's. The oversized aluminum isn't a dead giveaway as there were a few brands using the OS aluminum. The unique attribute on your frame is the extended axle. I had one from that era, sorry no photos. Google 1991 Cannondale SM800 and you'll see what I'm talking about.

Enjoy the bike for many miles
Thanks people.

So this is a Cannondale as evidenced by the extended dropout? Weird looking design and a possible stress riser.

I guess I'll need to find the serial number on this beast.

Oh, the triple crankset has a really weird inner ring and mounting on it. HAs anyone seen anything like this? Is it a factory made unit or a conversion someone did?

IMG_3841 by Miele Man, on Flickr

IMG_3842 by Miele Man, on Flickr

IMG_3843 by Miele Man, on Flickr

IMG_3844 by Miele Man, on Flickr

IMG_3845 by Miele Man, on Flickr

Thanks again and cheers

Last edited by Miele Man; 06-26-16 at 10:44 PM. Reason: Changed 1st image
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Old 06-27-16, 03:00 AM
  #5013  
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Originally Posted by Miele Man
Hi.

The shift levers I used are old Shimano downtube ones. You can use just about any shifter though including stem mount ones. I just removed the extra brake lever that was mounted on the side of the brake lever body and then i modified that brake lever pivot to accept the innards of the shifter. I think it took about 5 minutes to file the two flats on the right brake leber pivot and even less to do the left one.

Here's a site that shows brake levers similar to the ones I used.

Hugh`s bicycle blog: Suicide Levers! We don`t need no STINKING Suicide Levers!

The first image shows him removing the auxilary brake lever.

The second image shows him cutting off the section of the pivot that extends out past the brake lever body and that the auxiliary brake lever fits over and is bolted to. That extension is the part I made 2 flats on and then mounted the shifter on.

If i can get another suicide brake lever soon I'll do a step by step of the converting.

Cheers
Amazing and ingenious, this is why I love this forum.
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Old 06-27-16, 04:33 AM
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Originally Posted by Jeff Neese
I personally think that's one of the worst blunders in bicycle design, ever. Putting the brake cable stop inside the stem means you can't raise or lower your handlebars without also having to redo your front brake. Stupid. I always throw those stems away, and use either the cheap Sunlite hanger (which works fine, and even has an adjusting barrel and comes in either black or silver), or the Tektro fork-mounted stop.

In addition, if you're going to get front brake shudder, it's going to come from having the stop way up there and all that cable length. Having the stop fork-mounted, either at the top (part of the headset stack) or at the crown, provides much better braking.
When you get a box of them built up, send them to me? Throwing stems away for that means you're throwing away nearly every mtb stem you come across made from 1980-1994, including bullmoose bars?,,,,BD
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Old 06-27-16, 07:48 AM
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Originally Posted by Miele Man
Thanks people.

So this is a Cannondale as evidenced by the extended dropout? Weird looking design and a possible stress riser.

I guess I'll need to find the serial number on this beast.

Oh, the triple crankset has a really weird inner ring and mounting on it. HAs anyone seen anything like this? Is it a factory made unit or a conversion someone did?

IMG_3841 by Miele Man, on Flickr

IMG_3842 by Miele Man, on Flickr

IMG_3843 by Miele Man, on Flickr

IMG_3844 by Miele Man, on Flickr

IMG_3845 by Miele Man, on Flickr

Thanks again and cheers
Might be a Mountain Tamer Quad. It allowed a fourth chainring (a cog?) to be attached. Note the 20t, which did not exist until MicroDrive

Cannondale cantilever stays broke more often than the latter designs. I snapped my 90 m300 dropout BITD

Last edited by DorkDisk; 06-27-16 at 07:52 AM.
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Old 06-27-16, 08:47 AM
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Coming along nicely. I need to string up the rear brake, finish the bar tape, and get the new chain on.

BEFORE:


AFTER:


I'll get some specifics listed once I get it rolling ready.
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Old 06-28-16, 08:23 AM
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Originally Posted by SeanBonham
All done!




Can't wait to take it out. Crappy day out today, but the ride around the block was fun!

All in all about $350 spent on it
This bike is for sale, if anyone is interested PM me. I hate to part with it, but the stable is growing. It will be going cheap!
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Old 06-28-16, 11:58 AM
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Originally Posted by Miele Man
If i can get another suicide brake lever soon I'll do a step by step of the converting.
Thanks for posting, and I'd like to enthusiastically encourage you to do post a review of how you did it. It will be a resource many cyclists will search out, use, and thank you for. And then you'll have all that good karma working for you.

I'm already thinking of stepping this process forward...perhaps TIG welding a sacrificed stop onto the lever body itself. I'd really like to see your process.

I've said it many time before....sheesh, I love this thread.

Last edited by simmonsgc; 06-28-16 at 12:14 PM.
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Old 06-28-16, 06:07 PM
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That suicide lever modification is brilliant. I've always hated those levers.
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Old 06-30-16, 08:34 PM
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I did something very similar when I lived in Hawaii, Bolted MTB lever and body in place of the chicken bars on no name brakes... Nice job!

Originally Posted by Miele Man
Here's my lasted MTB/Dropbar Frankenbike.

Plus, there's now a new use for those old Suicide Brake Levers.

The SUMMIT MTB bicycle was given to me because the shifters were busted, the rear derailler cable housing stop was missing and the crank barely turned.

I used a barrel adjuster from a rear derailler and clamped the adjuster with a hose clamp to the chainstay so that the adjuster acts as the cable housing stop.

I didn't want the expense of buying eith barend shifters or integrated brake lever shifters for the dropbar I wanted to use. The dropbar came off another old bike and it had brake levers with the auxiliary suicide levers. Inspiration struck!

I removed the suicide levers and file a flat on opposite sides of the stb sticking out from the brake lever body. This stud is actually the brake lever pivot. The flats were file so thatt hey accept the rectangular slot inthe sghifter innards. Once the flats were file I simply mounted the shifters onto the brake pivot stud and used the original suicide lever retaining bolt to keep the shifter in place. The shifter cable feeds into shifter cable housing that is tightly taped to the dropbar and then covered with bar tape.

The shifter is very easy to use with a thum or finger and shifts very well.

Here are some images.

Bike.

The Shifter in use.

Brake Lever Mounted Shifter Operation 01 by Miele Man, on Flickr

Brake Lever Mounted Shifter Operation 02 by Miele Man, on Flickr

Brake Lever Mounted Shifter Operation 03 by Miele Man, on Flickr

So, now it's possible to convert an MTB to a dropbar bicycle even if you don't have barend or integrated brake/shifters. Plus it's a great use for those old suicide brake levers.

Cheers
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Old 07-01-16, 03:05 AM
  #5021  
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Originally Posted by SeanBonham
This bike is for sale, if anyone is interested PM me. I hate to part with it, but the stable is growing. It will be going cheap!
What year is it? I'm riding an 84 now. It looks a lot like that.
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Old 07-01-16, 06:27 AM
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Originally Posted by cs1
What year is it? I'm riding an 84 now. It looks a lot like that.
Pretty sure it is an 83
https://mombat.org/MOMBAT/Bikes/1983_...umpjumper.html
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Old 07-01-16, 08:07 AM
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SpEd, Howdy;

Originally Posted by SpEd
Coming along nicely. I need to string up the rear brake, finish the bar tape, and get the new chain on.

BEFORE:


AFTER:


I'll get some specifics listed once I get it rolling ready.
Like what you've done, very similar to what I'm contemplating.
When you swapped the front fork how many spacers did it take to raise the stem
to the level that you have it? Also, is that an adjustable stem you have?
Looking forward to seeing the 'specs' when you post them.

hank
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Old 07-01-16, 09:25 AM
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Originally Posted by hankaye
Like what you've done, very similar to what I'm contemplating.
When you swapped the front fork how many spacers did it take to raise the stem
to the level that you have it? Also, is that an adjustable stem you have?
Looking forward to seeing the 'specs' when you post them.
hank
Hank,

I have a threaded to threadless stem adapter so I didn't need any spacers. I just maxed out the adapter height and set it there for cabling up purposes.

The stem is an adjustable one, and I have it set to 90 right now. For cabling up purposes I have everything maxed out so I don't need to worry about cable lengths when I start dialing everything in.

I have yet to get the rest of the cables on, and still need to get my chain on. Hopefully I get time this weekend.
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Old 07-01-16, 06:34 PM
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SpEd, Howdy;

Ok, see that now. Mine is thread-less to begin with so, reckon I'll
need to work out a solution for it.
Thanks for the responce.

hank
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