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fh rm 40 hub to 126mm axle

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fh rm 40 hub to 126mm axle

Old 07-05-17, 10:48 PM
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fh rm 40 hub to 126mm axle

can i convert a FH RM 40 to 126mm for use with old french 700c wheels ? 7 speed?
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Old 07-05-17, 11:00 PM
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I'm a bit confused by the phrasing. But I suspect that you mean converting 135mm hubs to fir into your old 126mm frame.

I doubt it. You can't shorten the right side, and I doubt there's 9mm in spacers you could remove from the left.

OTOH - you're thinking about this backward. Don't narrow the hub, widen the frame. Spreading steel frames is easy enough, and will allow you the freedom to use wider components, and more speeds with less wheel dish.
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Old 07-06-17, 01:04 PM
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Originally Posted by FBinNY
I'm a bit confused by the phrasing. But I suspect that you mean converting 135mm hubs to fir into your old 126mm frame.

I doubt it. You can't shorten the right side, and I doubt there's 9mm in spacers you could remove from the left.

OTOH - you're thinking about this backward. Don't narrow the hub, widen the frame. Spreading steel frames is easy enough, and will allow you the freedom to use wider components, and more speeds with less wheel dish.

Plus, the redishing would put the drive side spokes at a more vertical position... NOT GOOD! Catastrophic wheel failure may occur, at the worst possible moment.... probably while you're leaned over in a fast right hand corner, just after hitting a bump.......

ooops... i was relying on FB's guess as to hub O.L.D...... here's the hub... solid axle... 130mm O.L.D, so the axle length is not a factor... https://www.ebay.com/itm/SHIMANO-FH-R...8AAOSw4DJYfzsY

there's a reason that spokes meet the rim at an angle.... STABILITY.... you will lose a bit of stability in the wheel... and those "solid axles" bend real easily, so they then like to break after bending... not as easily as the freewheel type hubs, but still........

RESET THE FRAME... 2mm a side ain't diddly.

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Old 07-06-17, 01:27 PM
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Originally Posted by lowlux
can i convert a FH RM 40 to 126mm for use with old french 700c wheels ? 7 speed?
Absolutely. I've respaced several 130mm and 135mm 7-speed hubs back down to 126mm for use on my bikes.
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