Bicycle Mechanics - Fork width
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09-30-11, 12:13 PM
Hi folks, I'd appreciate a word of advice about fork width. I've a Reynolds 653 frame - (about 1991) and forks. Chainstay width 125mm, which seems to be a standard but my front forks are, equally, 125mm in-between the two forks. I've been told this isn't standard for forks. I've checked the forks there are no cracks or stretch marks to show they've been adapted, so I was just wondering what folk thought. Is it just the obvious striking me in the face: all bikes are different; or is there a standard size that these are not. I'd appreciate guidance as I don't want to 'fork-out' on stuff for the frame if it's gonna be difficult to buy the basics that fit. Many thanks. Gerald
09-30-11, 01:23 PM
the standard width for fork is 100 MM . if it dept. store bike then it 86 MM. are you sure the dropouts (the end of the fork ) are not bent?
09-30-11, 01:26 PM
What others have told you, that 125mm isn't a standard spacing for front forks, is correct. Standard spacing is 100mm for the vast majority of bikes, exceptions being older and low end bikes which had spacing around 90-95mm and what are termed "big-hit" bikes, some of which having 110mm spaced thru-axle front hubs. Of course, there are also a few bikes like the Surly Pugsley and those by Jeff Jones that use a 135mm hub in the front.
With that said, since your frame is steel (and decent steel at that) I would consider taking it to your LBS to have the fork blades cold set to the standard dimension. With that relatively simple modification, installation of widely available parts will be possible. Good luck!
09-30-11, 02:58 PM
The drop outs don't look bent, as I mentioned it all looks intact and fine. Maybe the chap who had it originally widened the forks for some reason - don't know. I may well have them reset, need to see if I can track any wheels down to fit it as it currently is. Many thanks for the advice.
09-30-11, 03:15 PM
You could play with front axle length, but I'd ascertain if its in alignment. at all ..
blades equidistant from the center line, and neither blade ahead of the other,
perpendicular to, CL. and relative to the fork crown.
Bike shops have a reference jig.
A rear for single speeds , 120 was 5 speed ,126 for 6-7 speed , 130 for road everything since.
ditto , symmetrical to the centre line.
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