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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 01-15-07, 06:00 AM   #1
craigdurkee
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converting old mtb

I need to convert an old MTB and to be honest i dont know where to start

Some of the guides i have read (sheldon brown) etc dont mean a thing to me.

Can someone give me a simple step by step instruction on how to achieve this

Hope there are some takers to walk this newbie through

i can post pics of the different components if that will help

www.cmassworld.au.tt
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Old 01-15-07, 06:04 AM   #2
LóFarkas
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SS or fixed? Horizontal or vertical dropouts?

No step by step is possible, too many variables.
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Old 01-15-07, 08:46 AM   #3
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This is a good kit to get if you are planning on going SS.
Out of stock now, but it looks like it'll be available again.

http://www.performancebike.com/shop/...isearch=true##
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Old 01-15-07, 08:53 AM   #4
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Quote:
Originally Posted by bonechilling
This is a good kit to get if you are planning on going SS.
Out of stock now, but it looks like it'll be available again.

http://www.performancebike.com/shop/...isearch=true##
That kit no worky if you have a freewheel and not a freehub.

Craigdurkee, you are going to need to be more specific if you want help here. If the sheldon tutorial doesn't make sense, go to his glossary and read about the terms you don't understand. Particularly if you have a freewheel and will need to respace and redish the wheel, this is not a basic repair task. Not to say you or any other reasonably mechanically inclined person can't do it, but it's not dirt simple.
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Old 01-16-07, 12:58 AM   #5
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pics

<center>
<a href="http://i89.photobucket.com/albums/k203/craigjdurkee/ABCD0006.jpg" target="_blank">
<img src="http://i89.photobucket.com/albums/k203/craigjdurkee/th_ABCD0006.jpg"></a>
<a href="http://i89.photobucket.com/albums/k203/craigjdurkee/ABCD0005.jpg" target="_blank">
<img src="http://i89.photobucket.com/albums/k203/craigjdurkee/th_ABCD0005.jpg"></a>
<a href="http://i89.photobucket.com/albums/k203/craigjdurkee/ABCD0004.jpg" target="_blank">
<img src="http://i89.photobucket.com/albums/k203/craigjdurkee/th_ABCD0004.jpg"></a>
</center>

the pics
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Old 01-16-07, 04:13 AM   #6
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As you have horizontal dropouts, you don't need any sort of chain tensioner, and the job should be pretty simple.

You will need something to convert your rear wheels cassette to a single cog. You haven't shown any pictures of the rear wheel, so not sure how many gears you have, and whether it's a screw on cassette or a freehub body, this dictates what you need to convert to a single cog.

Once you've sorted out the rear cog, you ideally would need to repace that chainset, as it appears to be one that won't allow you to remove the outer and inner chainrings (I may be wrong, but that's how it looks in the piccy). You could run it as is, and just use the middle ring (I assume this is for offroad single speeding?), but it would look a bit gash.

Once the above are sorted out, you just need to shorten the chain to loop around the single rear cog and the middle chainring, and slide the wheel back in the drop out to give the necessary tension on the chain to stop it jumping off the cogs on a rooty downhill etc.

We need to know if you can remove the chainrings from your chainset, and what type of rear cassette you have to give the final analysis.

Si.
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Old 01-16-07, 07:09 AM   #7
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I converted my 1994 entry level GT to a singlespeed. The crankset on it had the cheap welded together chainrings, similar to what's on the OPs bike. Five minutes with a dremel tool, and the big ring was no more. At some point I may get motivated enough to do the same to the granny ring. Not the best looking solution, but it's cheaper than a new crankset, and looks better than a full triple.
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Old 01-16-07, 07:14 AM   #8
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Here is a photo. The bike is a wip, and will be my winter beater. In the next couple of weeks, I'll be dumping the rear cluster in favor of a proper cog and spacers. Also, I'll be slotting the (vertical) drops, and losing the cheap Acera chain tensioner.

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Old 01-16-07, 07:26 AM   #9
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Old 01-16-07, 10:36 AM   #10
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First place to start ...

Remove:
shifters
shifter cables,
front-derailer
rear-derailer
chain

From there you'll have a place to go.

Nevermind.. you already did that.. HAHAH
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Old 01-16-07, 04:20 PM   #11
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is a suicide set up strong enough for mtn biking? i have an old beater (marin alum frame, horiz d/o's) that i wouldn't mind converting for occasional use on the trails. i am pretty sure it's a 7 speed shimano hub from 91 - 92. almost positive.

if not what's my least expensive route?
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Old 01-16-07, 04:33 PM   #12
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Quote:
Originally Posted by iridetitus
is a suicide set up strong enough for mtn biking? i have an old beater (marin alum frame, horiz d/o's) that i wouldn't mind converting for occasional use on the trails. i am pretty sure it's a 7 speed shimano hub from 91 - 92. almost positive.

if not what's my least expensive route?
Yes, if you keep the brakes. Otherwise, cheapest option is a new rear wheel plus new BB to take care of chainline
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Old 01-16-07, 05:36 PM   #13
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nashbar also has a cheap kit if you have vertical drops...I have these on my mt/winter ss ride and works great..usually these are 19.95 and with a % coupon off cheaper

http://www.nashbar.com/profile.cfm?c...A%20Freewheels
Bike Nashbar.com - Nashbar Single Speed Kit
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Old 01-16-07, 06:17 PM   #14
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Mine is easy. And, being painted by moi, it looks unholy killer. Anyways...

If'n you've got vertical dropouts, an easy, albeit fairly ghetto-tech solution is the Surly Singleator, or even just the setup you've got, with the chain run through the immobilized derailleur (tune the lower limit and remove the shifters.) A good investment, if this is the case, would be a cog and chainring designed for single speed use, so that you would have less risk of derailment, even if you still ran a 3/32" chain.

If you've got horizontal dropouts, you can either build up another wheel, buy one prebuilt, or save some shrapnel and use what you've got, with the spacer trick that has undoubtedly been mentioned already.

Really, converting to singlespeed is pretty much the easiest thing in the world.
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Old 01-17-07, 12:04 PM   #15
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Quote:
Originally Posted by craigdurkee
Can someone give me a simple step by step instruction on how to achieve this
Step-by-step instructions.
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