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Any single-speeders out there?(5 posts)

Any single-speeders out there?cory
Aug 31, 2001 9:28 AM
I've got more bikes sitting around than I know what to do with, and I'd like to convert an old Trek tourer to SS. I'm not real serious about it, so I'm trying not to spend a bundle of money. Can anybody add to this list or tell me if I've pretty well got it figured out?

--Use the existing crank & one ring, probably a 39 (it's hilly around here). I have a bunch of rings on the wall, so I can fiddle that if 39 turns out to be wrong.
--Can I slip on a single-speed freewheel from Sheldon Brown with a stack of spacers and get an acceptable chain line? I'll work out the gearing before I order, but I'm thinking a 17.
--And I need a tensioner, probably a Singleator.
Am I missing anything obvious, and have I overlooked a hidden requirement that's going to make me say, "Honey, I'm going to have to spend another $250 on that old POS"?
only in mtbing but,moschika
Aug 31, 2001 10:06 AM
in answer to some off your questions
if using an old chainring you might have problems with the chain falling off if the chainring has ramps or pins to help with shifting. use one that's without those.
you wouldn't be able to slip on a freewheel with a stack of spacers onto your existing hub. unless your hub is old enough to be the kind that you can screw on the freewheel. what you may be able to do is use cog from from your cassette with spacers. you should be able to get an acceptable chain line. you might also have to re-dish the wheel.
as for a tensioner, you could save money by just using an old derailleur. works just as well. just set the limiting screws, cut off the lower pulley and viola!
any way i hope this helps a bit
Sure...Andy M-S
Aug 31, 2001 10:26 AM
It's easier than you imagine. A single chainring driving a single cog. If you have a cassette body on the rear wheel, just use spacers to optimize the chainline. If you have horizontal dropouts, no tensioner is needed--just slide the wheel to snug up the chain (leave just a touch of slack) and clamp down the QR (tight!). You're set.

I use an old 105sc 42t chainring linked to a 17t UG cog, sandwiched with spacers. The chainline is perfect, and the bike is QUIET. No derailers to catch junk (no tensioner, either) so this is my offroad road/bad weather bike.

If you're lucky, setting this bike up will cost you nothing at all!
re: Any single-speeders out there?Alpedhuez55
Aug 31, 2001 10:59 AM
How old it the touring bike? You may not need the the tensioner. If you have horizontal dropouts you may have enough room to adust it to work properly. I needed a little more room on my Old Centurion conversion so I filed the dropouts about an extra half inch. I am using a flip flop hub with a 16 tooth fixed gear and a 17 freewheel. It gave me some extra adjustment so I could use both gears/

I would also consider changing the axle to a sold axle with lugnuts as opposed to a quck release. You will want the hub a little tighter so you do not pull the wheel out of the drop outs. Lugnuts will have better grip than a quick release will.

I would use chainring spacers instead of the frewheel spacer. Any shop that has BMX parts will have them. They will let you get a good chainline.

Good luck and let me know if you have any other questions.
re: Any single-speeders out there?muncher
Sep 4, 2001 5:24 AM
Go for it - it ought to be cheap. If you have the flat drop outs, you won't need the tensioner, but the advantage of one is that you can use a longer chain, and hence swap components for a higher/lower gearing if you want to - especially useful with a dual ratin flip-flop hub etc, or if you just want to fool around with front/rear rings till you get the gear you are happy with.