Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

Show Your Vintage MTB Drop Bar Conversions

Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

Show Your Vintage MTB Drop Bar Conversions

Reply

Old 01-25-19, 07:08 PM
  #6351  
tricky 
Senior Member
 
Join Date: Oct 2005
Location: Upper Left, USA
Posts: 854
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 163 Post(s)
Originally Posted by Aww View Post
Ye, I have, but just to put it together and check if I want to ride this, with 3x8 Sora shifters that time (well, different setup overall). Had issues with getting the FD to not to touch chain at big chainring/small wheel, or one of the smaller ones. But you are correct, it is worth a try, there is still time to make it into perfection. At the moment, I'm not having all the parts on the same place as the bike is, so in a week or two, I'll just try to put it all together and we'll see .)
I did some googling. I found this. https://www.modernbike.com/shimano-a...ont-derailleur Check the cable pull, but maybe this would work? Here are a few more. https://www.modernbike.com/front-der...ullisdual-pull
tricky is offline  
Reply With Quote
Old 02-03-19, 03:32 PM
  #6352  
RicardoDeGalvez
Newbie
 
RicardoDeGalvez's Avatar
 
Join Date: Feb 2019
Location: Nashville Tennessee
Posts: 2

Bikes: A blue one

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I have just picked up an old mountain bike frame and planning to convert to a drop bar for commuting, errands, and maybe touring. I am assuming I would want to put more road oriented gears on it, is that correct?

There are single braze-ons at the front and rear. I have seen fenders and rear racks attached to the same braze-on, Is there any reason I wouldn't want to do this?
RicardoDeGalvez is offline  
Reply With Quote
Old 02-03-19, 07:03 PM
  #6353  
wrk101
Thrifty Bill
Thread Starter
 
wrk101's Avatar
 
Join Date: Jan 2008
Location: Mountains of Western NC
Posts: 21,698

Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more

Mentioned: 60 Post(s)
Tagged: 0 Thread(s)
Quoted: 552 Post(s)
Originally Posted by Aww View Post
Been checking this thread for ages, awesome conversions everyone.

If it is not OT here, I might ask for advice, since I'm in the process of converting early 90s mtb to drop bars.
The issue is about the front derailleur, I have 3x7 road STIs (RSX) ready for this, and would love not to lose any chainring. So far it is - those 3x7 STIs, FD-M561 front derailleur (31.8, cable comes from the top), and crankset is not decided yet, got plenty to choose from.
From what I have read, road STIs have different cable pull for the front derailleur (same for rear one) than mtb STIs, therefore if I just connect it the way it is, it won't be possible to reach one part of the crankset. Using road tripple cranks won't help (?). Has anyone gone through the same with any simple sollution?
From what I understand, it seems that
- I can find a road fd (needing less cable pull), which seems unlikely because of the 31.8 and cable from the top. Or are there any?
- I can connect it the way it is and make it 2x7, with both clicks on STIs needed for each shift. Easiest, but would prefer not to do this.
- I can try to customize the FD somehow - have seen some pictures, but still pretty unsure how and if I can make it.

Am I missing any option, or an easy but still reliable fix?
.)
Ideal for me would be to install both STI shifters, but use the front lever just as a brake. Then install either a bar end shifter, or a DT shifter to control the FD. I prefer friction on the FD anyway. Since my Cimarron does not have shifter mounts on the DT, I would just pull out an orphan bar end shifter for one side. Sure, it might look a little odd, but functionally it would work great.
wrk101 is offline  
Reply With Quote
Old 02-04-19, 12:06 AM
  #6354  
biketroubadour
Junior Member
 
Join Date: Jun 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Originally Posted by alecjahn View Post
What was the symptom you had that led you to the single click setup fix? I can't get my FD to extend enough and the current idea is a narrower BB. I can shift into that gear just fine but with the limit screw all the way out and I'm on small (rear) to big (front) the chain rubs (fd not extending enough). If I press on the brifter more it will, with the limit screw all the way out, easily pull enough cable (beyond the final click). It's just not indexing with enough pull. It kinda seems like this might be the key for my setup (XT fd) but I'll have to get it on the work stand and spend some more time with it.
You'll probably need a shorter BB axle. But it also sounds like you cable tension may be too low if you have lots of movement beyond the final click. I'd start by increasing tension, & if that isnt working go with a bb around 2-3mm shorter to start.
biketroubadour is offline  
Reply With Quote
Old 02-04-19, 05:19 AM
  #6355  
beicster 
Senior Member
 
Join Date: Jan 2017
Location: Berea, KY
Posts: 552
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
Originally Posted by RicardoDeGalvez View Post
I have just picked up an old mountain bike frame and planning to convert to a drop bar for commuting, errands, and maybe touring. I am assuming I would want to put more road oriented gears on it, is that correct?

There are single braze-ons at the front and rear. I have seen fenders and rear racks attached to the same braze-on, Is there any reason I wouldn't want to do this?
I have been doing that for years on various bikes and other than being a bit more fiddly to install, I have never had a problem with it.
__________________
Andy
beicster is offline  
Reply With Quote
Old 02-06-19, 02:55 PM
  #6356  
due ruote 
Senior Member
 
due ruote's Avatar
 
Join Date: Dec 2006
Posts: 6,536
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 429 Post(s)
Mounted a bag. An excuse to post another pic and keep this thread going!

due ruote is offline  
Reply With Quote
Old 02-06-19, 04:25 PM
  #6357  
simmonsgc
Senior Member
 
simmonsgc's Avatar
 
Join Date: Dec 2010
Location: NC High Country
Posts: 639
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 76 Post(s)
Originally Posted by due ruote View Post
Mounted a bag. An excuse to post another pic and keep this thread going!
Great pic, great looking bike.
simmonsgc is offline  
Reply With Quote
Old 02-07-19, 11:28 AM
  #6358  
due ruote 
Senior Member
 
due ruote's Avatar
 
Join Date: Dec 2006
Posts: 6,536
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 429 Post(s)
Originally Posted by simmonsgc View Post
Great pic, great looking bike.
Thanks.
due ruote is offline  
Reply With Quote
Old 02-10-19, 07:19 PM
  #6359  
biketroubadour
Junior Member
 
Join Date: Jun 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Originally Posted by Aww View Post
Been checking this thread for ages, awesome conversions everyone.

If it is not OT here, I might ask for advice, since I'm in the process of converting early 90s mtb to drop bars.
The issue is about the front derailleur, I have 3x7 road STIs (RSX) ready for this, and would love not to lose any chainring. So far it is - those 3x7 STIs, FD-M561 front derailleur (31.8, cable comes from the top), and crankset is not decided yet, got plenty to choose from.
From what I have read, road STIs have different cable pull for the front derailleur (same for rear one) than mtb STIs, therefore if I just connect it the way it is, it won't be possible to reach one part of the crankset. Using road tripple cranks won't help (?). Has anyone gone through the same with any simple sollution?
From what I understand, it seems that
- I can find a road fd (needing less cable pull), which seems unlikely because of the 31.8 and cable from the top. Or are there any?
- I can connect it the way it is and make it 2x7, with both clicks on STIs needed for each shift. Easiest, but would prefer not to do this.
- I can try to customize the FD somehow - have seen some pictures, but still pretty unsure how and if I can make it.

Am I missing any option, or an easy but still reliable fix?

Thanks for ideas in advance, got about a week to think about this, then I'll have some time to play with the conversion, post pics and such .)
if you can find one of these pulleys at your local bike co-op, you can mount it above or below the fd to change cable pull direction as needed. Then you can get a 31.8 braze on adapter & use any braze on style 3 speed road derailleur you want. If you look back a few posts at my purple Concorde, that's exactly what I did to be able to use a 105 fd even though the frames cable guides are for top pull mtb fd's. I just mounted the pulley below the 105 fd sent the cable down to the pulley, around it & up to the fd. You might have to do something clever to adapt the band to 31.8 though (bolt an extra length of aluminium with bolt holes on each end in there most likely)
biketroubadour is offline  
Reply With Quote
Old 02-11-19, 10:57 AM
  #6360  
3speedslow
Senior Member
 
3speedslow's Avatar
 
Join Date: Oct 2010
Location: Jacksonville, NC
Posts: 6,723

Bikes: A few

Mentioned: 76 Post(s)
Tagged: 0 Thread(s)
Quoted: 1023 Post(s)
^^This would be cheaper then using the Problem Solver adaptation.
3speedslow is offline  
Reply With Quote
Old 02-11-19, 01:39 PM
  #6361  
HarborBandS
HarborBandS
 
Join Date: Jun 2018
Location: Chicago Western Suburbs
Posts: 153
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
Originally Posted by 3speedslow View Post
^^This would be cheaper then using the Problem Solver adaptation.
I used a Problem Solver's "Cross Clamp with Cable Pulley" over the weekend to convert a top-pull frame to a bottom pull derailleur and STI brifters, and it works beautifully. They are about $20, and seemingly more robust than this vintage Sturmey Archer piece--but it's the same idea.

I'll post the bike when it's done, though it's a 2002 Trek 7500 FX "Fitness Bike" with 700c wheels instead of a proper 26" mountain bike. But the frame and components were totally MTB, so the conversion is similar.

Last edited by HarborBandS; 02-11-19 at 01:46 PM.
HarborBandS is offline  
Reply With Quote
Old 02-11-19, 04:14 PM
  #6362  
3speedslow
Senior Member
 
3speedslow's Avatar
 
Join Date: Oct 2010
Location: Jacksonville, NC
Posts: 6,723

Bikes: A few

Mentioned: 76 Post(s)
Tagged: 0 Thread(s)
Quoted: 1023 Post(s)
^^True, I’ve no doubt it would work. That’s why I also have one waiting for a project, if one comes up. I just thought as far as cost wise...
3speedslow is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service