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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 06-15-04, 03:57 PM   #1
PGZX3
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crossover parts???

how many people here run bmx parts on their single speed bikes????? I was thinking I could use a bmx rear hub and possibly even a bmx crank with a conventional bmx style sprocket (since they come in so many different sizes these days) on my MTB.......thoughts, concerns, etc??????
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Old 06-15-04, 04:11 PM   #2
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BMX hubs (110 or 120mm spacing, like track hubs) won't fit in the 135mm spacing of conventional mtbs. On my MTB ss I just used a bunch of cassette spacers on my Shimano Cassette Freehub to get the chainline right and a Shimano DX BMX sprocket. I also run a Bell-branded KMC BMX chain with a half-link. The cranks should work though as will the BMX sprocket.
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Old 06-15-04, 04:25 PM   #3
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Quote:
Originally Posted by PGZX3
how many people here run bmx parts on their single speed bikes????? I was thinking I could use a bmx rear hub and possibly even a bmx crank with a conventional bmx style sprocket (since they come in so many different sizes these days) on my MTB.......thoughts, concerns, etc??????
I run bmx hubs front and rear (respaced to 135mm), use a bmx cog, a bmx chainwheel, and run
3 piece bmx cranks. Works well so far...

See here for pics:

http://forums.mtbr.com/showthread.php?t=24473

baker
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Old 06-15-04, 05:51 PM   #4
jfmckenna
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BMX Chainring for me, nice high pointy symmetrical teeth and cheap too. I was lookin at a bmx freehub yesterday. I've got a flip flop and figure I may as well at least try it once.
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Old 06-15-04, 06:27 PM   #5
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On my SS (formerly an english 3-speed) I'm running a NOS Shimano hi-flange cassette rear hub. The freehub body is designed to accept a 3-spd/coaster brake style cog and circlip. The guy that gave it to me said it's for an old-school BMX. Fits in the dropout perfect, no bending the rear stays. I also got a Normandy hi-flange ft. hub to match the rear, laced to Sun AT18 EA3 aluminum rims. I know it's not a MTB, though.
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Old 06-15-04, 09:27 PM   #6
PGZX3
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Quote:
Originally Posted by bbaker22
I run bmx hubs front and rear (respaced to 135mm), use a bmx cog, a bmx chainwheel, and run
3 piece bmx cranks. Works well so far...

See here for pics:

http://forums.mtbr.com/showthread.php?t=24473

baker
that is sexy
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Old 06-16-04, 09:10 AM   #7
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that is sexy
Thanks! I think it turned out well and is super strong. I just picked up another
Shimano DX hubset (w/ 4 cogs) for $32 delivered. Ebay can be good if you're
patient. I think I'll build this new wheelset superlight, w/ DT Revs, alloy nips,
and Mavic 517's. Should be a good race wheelset...

baker
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Old 06-16-04, 11:58 AM   #8
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A BMX rear hub with a couple spacers would be great for a narrow back end (110mm OLN on BMXs), but not so good for 130 or 135. BMX flip flops are have regular freewheel threads on one side, and smaller threads on the flip for 14t or 15t ACS freewheels, useful if you don't like fixed and want a bigish gear difference (18t and 14t). Beware that most BMX hubs come in only 36h and 48h, some only with 48. But for what it's worth, unless you're very tough on hubs or want a 9t sprocket, BMX cassette hubs aren't worth it; road or MTB cassettes are a much better buy.

As for the cranks, make sure that your crankset of choice is available with a Euro BB. Some BMX cranks use square tapers, which presumably would fit a normal cartridge BB, but many use a 48 splined spindle with seperate bearings and cups, and there are some other spindle interfaces available that are unique to that brand. Luckily, there are only 2 or 3 spindle diameters, so one company's BB may well fit another's spindle (Profile Euro BB and Odyssey Black Widow cranks for instance).
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