can aluminum spread
I have an older trek 1500 7 speed can I spread the frame enough to fit in an 8 speed hub
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Originally Posted by litvack49
I have an older trek 1500 7 speed can I spread the frame enough to fit in an 8 speed hub
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Check your dropout spacing. There was a period in the early '90's when Trek made their Al frames with 128 mm spacing to fit both 7 and 8-speed hubs since the same frame was fitted with both types of components depending on price point.
My '92 Trek 1420 (bonded Al frame) was spaced that way. It came with a 7-speed 105 drivetrain but a more expensive model using the same frame came with 8-speed Ultegra. Recently I upgraded my 1420 to 8-speed and have no problems installing the wider hub with no modification to the frame. |
The frame is spaced at 126
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In general bending aluminum is a bad thing, Could you get away with it? probably. If it were me, I would stick with the gearing you have or get a new frame. tell your friends thy are weenies for needing so many gears.
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You can safely run a 130mm-spaced 8/9/10-speed road rear hub on most aluminum frames that were originally designed with 126mm-spaced dropouts. It's only 2mm of spread at each dropout. People do this all the time, as as noted above Nashbar's aluminum touring frame is designed 2.5mm between 130 and 135mm rear hub standards (road and mountain, respectively). I wouldn't do this with old carbon frames designed for 7-speed, but people (many of them quite knowledgable) do it with aluminum bikes all the time.
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Thanks for the help it will make a nice winter project
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Originally Posted by timcupery
You can safely run a 130mm-spaced 8/9/10-speed road rear hub on most aluminum frames that were originally designed with 126mm-spaced dropouts. It's only 2mm of spread at each dropout. People do this all the time, as as noted above Nashbar's aluminum touring frame is designed 2.5mm between 130 and 135mm rear hub standards (road and mountain, respectively).
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Originally Posted by HillRider
I agree but I'd reiterate what "well biked" posted above. Use the frame as-is and just exercise your thumbs when installing the 8-speed wheel, i.e., don't cold set the dropouts to the greater width.
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Ok I understand it was my intention to just flex the frame rather than cold set it thanks for all your help
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