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126mm wheel spacing, again(4 posts)

126mm wheel spacing, againtorelli
Mar 22, 2003 9:13 AM
I just can't remember this...at what point did hubs/wheels etc go to 130mm? Did the jump happen 8 to 9 cogs, or 7 to 8? Is an ultegra 8 speed 130mm? Do they still make bikes w/ 126mm spacing? Can you by new 126mm stuff? I'm trying to build up an older steel cross bike, and trying to find the newest old group to fit it...Thanks!
7-speed.Spoke Wrench
Mar 22, 2003 9:41 AM
Some 7-speeds were 126mm and some were 130mm. 1990 or so I'd say. I'd guess that you could make any rear hub with a 7-speed freehub body into a 126mm provided you acquired the right length axle.
re: 126mm wheel spacing, againRusty Coggs
Mar 22, 2003 9:45 AM
well.why don't you start with what the dropout spacing on your frame is.The change on road frames was from old 7 speed(126) to 8 speed(130) some late 7 speed road was also 130. Ultegra/600 8 is i30.
Dropout spacing historyAlexx
Mar 22, 2003 11:32 AM
Originally, the first "10-speeds" (and 8-speeds, too) were spaced at 120mm.

Ultra-6 came around, giving a 6-speed freewheel in a typical 120mm dropout. Spacing between cogs was narrower than on a 5-gear freewheel. A "7-speed" chain is needed for ultra-6, but i'm not sure if the spacing is the same or not.

Standard 6-speed freewheels came around, too, but I'm not sure which was first. Common 6-speed uses the same cog spacing and chains as the old 5-speed, but needed 126mm dropout spacing.

Common 7-speed freewheels/casettes came next, requiring a slightly narrower chain, but retaining the 126mm dropout spacing.

8-speed comes along next, using the same 7-speed chain and gear spacing, but needing a dropout spacing of 130mm.

9-speed retains the 130mm dropout spacing, but uses narrower spacing, as well as a narrower chain, too.

FWIW, you can make an 8-speed on a 126mm dropout, if you use 9-speed components and chains. I don't believe any bikes were initially sold that way, though..