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My First and a Question...(6 posts)

My First and a Question...sievers11
Nov 18, 2003 2:01 PM
Forgive me there are some gears on this, and the root of my question. I am going to go with a freewheel type comversion and am curious what the specs are on the cog that I need. 1/18 or 3/32? otherwise anything else I need to be aware of, besides the use locktite thing and looking for a make shift lock ring?

Backgound on conversion...This was my moms road bike, a 80's Gitane Olympic 2. Note the half crome fork and compact geometry. It has a really small head tube, but matches my race bike geometry to a T. The wheels are some of my dads old 27s, mavic rim, 14/15 spokes and cartridge specialized hubs. I have another closet bike that I might take the crank from to get a 170 lenght, but it also has some 700c tubulars that would be sweet.

Thanks
mmmm... old bike...... nice..... NMgspot
Nov 18, 2003 2:07 PM
clean look-- with a freewheel... -nmjoe friday
Nov 18, 2003 9:04 PM
re: My First and a Question...flybyvine
Nov 18, 2003 9:58 PM
I assume that you are not riding it yet because with that freewheel on there you are going to have problems stopping.

You can use a 1/8" track cog & a BMX chain (also 1/8") which will work fine with your 3/32" chainring. If you don't want the extra lateral slop then a 3/32" cog but it was easier for me to find a standard track cog (Dura Ace 1/8" ~USD14). BMX chain was also cheaper. I used an old BB lockring after the cog. Make sure you stomp on the cog before tignening up the lock-ring.

Using an old 6sp Shimano freehub and the Dura Ace cog I had perfect chainline with the inner chainring. Depending on your set-up, you may need to redish your wheel.

I'd recommend clipless pedals not just to help with stopping but so you don't lose contact when you are going downhill. Its next to impossible to get your feet back on a pedal when its spinning away at 120+ rpm - I had a worn cleat pull just last week & had to finish the downhill on one leg.

Thats all there is to it. I have left on brakes - only just learning skid stops but would still keep brakes anyway - I use it as a commuter.

Cheers
re: My First and a Question...big andy
Nov 19, 2003 9:37 AM
I would go 3/32, anyone who stocks a 1/8 cog (sheldon or ebayers) almost always has 3/32's also and they are the same price. the bmx chains are usually crap, and you can pick up a nice quality sram 8 speed chain for $10-15. Your chain ring is 3/32 so you might as well be consistent. just an opinion.
Did you say you WANT a freewheel on the new bike?OverStuffed
Nov 19, 2003 2:27 PM
If the current rear wheel has a freewheel, as opposed to a freehub, then you can take the cogset off, replace it with a freewheel, redish the wheel, and you're good to go. If you want a fixed-gear, you can either LocTite a cog and BB lockring (I know, someone else said this) onto the current hub, or you can buy a new rear wheel. SRAM makes a fine single-speed 3/32" chain for ~$10. The other thing to pay attention to is the wear of the chain and chainring. They may cause some sloppinness in you're chain tension, and keep it from being the smoothest ride. This Caused me to replace my entire drivetrain within a week of my conversion.

Nice bike.

--Kevin