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Converting an old Rolf wheel into a single speed.(8 posts)

Converting an old Rolf wheel into a single speed.Alex-in-Evanston
Jul 15, 2002 7:36 AM
The wheel has a Campy freehub - 10spd. I'm wondering if I can use the much, much less expensive 9spd spacers to center the 15 cog back there.

I'll be using a 113mm BB with some old mountain crankarms and an engagement ring. I think I should have plenty of fiddle-room to perfect the chainline just by using the spacers.

All this being said, I'm a total hack mechanic. Can anybody spot a glaring contradiction in this plan?

Thanks and regards,

ALex
Yes, It will work but............Dave Hickey
Jul 15, 2002 7:57 AM
I have two singlespeed bikes built this way. Mine are Shimano. The only problem I see is using a regular cog instead of a BMX cog. BMX cogs are not ramped. On a singlespeed wheels, you don't want a ramped cog. It's too easy for the chain to come off. I'm not familar with campy freehubs. It might be possible to file a BMX cog to fit the splines. As for the spacers, I took apart two old cassettes and they gave me plenty of spacers. The spacers were plastic and didn't have splines so it was no problem fitting them on the freehub.
Here is a Shimano BMX cog $4.95 at ExcelDave Hickey
Jul 15, 2002 8:06 AM
Or if money is no object, Chris King BMX cog $29.95Dave Hickey
Jul 15, 2002 8:08 AM
Stupid Campy stuff.Alex-in-Evanston
Jul 15, 2002 8:14 AM
Alas, I don't think there's a BMX cog on earth that's campy compatible.

Alex
Are you sure it won't work?Dave Hickey
Jul 15, 2002 8:28 AM
If you look at the King, you'll see that all the notches are the same length even though the Shimano freehub has different size notches. This works on Shimano, try emailing King and see what they say.
I'll do that.Alex-in-Evanston
Jul 15, 2002 8:48 AM
Thanks Dave,

Alex
your other optionoff roadie
Jul 15, 2002 12:20 PM
This might be a bit less adjustable and require a bit more mechanical aptitutude, but it would be mucho slick to have a Rolf with a true freewheel or fixed gear. It allows you to remove your Shimano freehub body and replace it with mounting threads for a fixed gear or SS free wheel.

http://www.surlybikes.com/parts/converter.htm

On the other hand, freehubs with BMX / King cogs are actually more dependable / long lasting than your typical $15 single speed freewheel. The converter is onlyt really worth it if you want to go fixed, and then you can probably build a new (but not as stylish as a Rolf) wheel with a cheap track hub for not much more cash than the converter costs.