new stem
08-01-05, 06:47 PM
#1
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new stem
One of my bikes is a vintage Motobecane conversion. I hadn't ridden it in many months and while riding it today I noticed the fork to be askew. So, I am in need of a new fork. My criteria: affordable, lugged, chrome, threaded, and relatively straight. In my search I came across this: https://store.airbomb.com/ItemDesc.asp?IC=FK3501
Now my question is. I've never really dealt with changing out a vintage threaded fork. What are the odds that the dimension fork will fit in my vintage french bike's headset? If somehow could tell me the measurements necessary to see if this fork will work and how to make them on my motobecane I'd be very appreciative. Thanks.
Now my question is. I've never really dealt with changing out a vintage threaded fork. What are the odds that the dimension fork will fit in my vintage french bike's headset? If somehow could tell me the measurements necessary to see if this fork will work and how to make them on my motobecane I'd be very appreciative. Thanks.
08-01-05, 06:48 PM
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i obviously meant to title this thread "new fork"
08-01-05, 08:38 PM
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take your old fork out and measure the steerer tube. as long as your fork's st is 1" in diameter, and 150mm or shorter you're good to go. if your fork's st is less than 150mm you'll need spacers...
08-02-05, 12:01 AM
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not neccessarily.
if you're dealing with a french threaded headset, you'll either need a french threaded steerer or a new headset and stem. french is cut as 25mm x 1mm instead of 1" x 24 TPI.
(new headset and stem would be both cheaper and easier to find)
a quick way to cheack (but maybe not entirely accurate) would be to look at your stem's quill diameter. If it's 22.2 mm you've got a regular ISO headet. If its 22.0 it's french. Or if you have a spare ISO headset, see if the locknut will thread onto your existing fork.
if you're dealing with a french threaded headset, you'll either need a french threaded steerer or a new headset and stem. french is cut as 25mm x 1mm instead of 1" x 24 TPI.
(new headset and stem would be both cheaper and easier to find)
a quick way to cheack (but maybe not entirely accurate) would be to look at your stem's quill diameter. If it's 22.2 mm you've got a regular ISO headet. If its 22.0 it's french. Or if you have a spare ISO headset, see if the locknut will thread onto your existing fork.
08-02-05, 02:22 PM
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whoops, meant to mention that...
08-02-05, 02:51 PM
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Hyper, you're in Milwaukee, correct? Ben's has a buncha used forks, lotsa take-offs. Maybe you can sweet talk one of the employees into letting you pick thru their stash.
08-02-05, 03:08 PM
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other than the blades being slightly off, the whole fork itself appears to slightly bend toward the downtube as it comes out of the headset. It's slight but definitely there. Also, since it's a vintage fork, the rake is super steep and it'd be nice to get a new fork and make my front tire tighter.
My quill is 22.2 and the headset nut is 32mm so I think that I probably have a pretty standard 1in fork.
My quill is 22.2 and the headset nut is 32mm so I think that I probably have a pretty standard 1in fork.
08-02-05, 03:24 PM
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Bikeworks has a pretty nice chrome, straight-blade, threaded fork. Check it out.
More expensive than the airbomb, but maybe the geometry is closer to what you're looking for?
m.
More expensive than the airbomb, but maybe the geometry is closer to what you're looking for?
m.
