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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 12-11-09, 08:41 AM   #1
pocketaf
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650 C Botrager Fork on 90's bike

Hi there
I have a question accordingly new 650 C BONTRAGER Trek bike fork and adjusting it to the 90's bike road frame. Is it possible and what should i check to know? Can the fork be threaded like old-school ones? or i will need to use new standard stems

fork looks like this: http://i.ebayimg.com/08/!BZuu%28VgBWk~$%28KGrHgoOKiQEjlLmZ!24BKoD9-%29uC!~~_35.JPG
and bike is very similar to this one http://velospace.org/files/IMG_1725.JPG

and what would be advantages and disadvantages of doing that? i mean changing 700C front fork to 650C same with wheel.

Thanks in advance!

Last edited by pocketaf; 12-11-09 at 08:57 AM.
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Old 12-11-09, 09:13 AM   #2
ianjk
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Originally Posted by pocketaf View Post
Hi there
I have a question accordingly new 650 C BONTRAGER Trek bike fork and adjusting it to the 90's bike road frame. Is it possible and what should i check to know? Can the fork be threaded like old-school ones? or i will need to use new standard stems

fork looks like this: http://i.ebayimg.com/08/!BZuu%28VgBWk~$%28KGrHgoOKiQEjlLmZ!24BKoD9-%29uC!~~_35.JPG
and bike is very similar to this one http://velospace.org/files/IMG_1725.JPG

and what would be advantages and disadvantages of doing that? i mean changing 700C front fork to 650C same with wheel.

Thanks in advance!
Advantages = None that I can think of.

Disadvantages = Handling is going to change, more than likely not in a good way.

What is your intent with this? Trying to make your bike look "pursuitish"?
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Old 12-11-09, 09:58 AM   #3
pocketaf
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i was up to front carbon fork during the time, to decrease weight. but reason of 650 C as you sad to make "pursuitish". How it could affect handling btw.
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Old 12-11-09, 10:47 AM   #4
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i was up to front carbon fork during the time, to decrease weight. but reason of 650 C as you sad to make "pursuitish". How it could affect handling btw.
You will be changing the geometry of the bike.

Look at the head tube angle on an actual pursuit frame:



Now imagine it with a longer road fork and bigger front wheel, it will lift the front up and look a bit like a chopper.

Now look at a road head tube:



Note the head tube angle. Now imagine putting on a shorter fork and smaller wheel, the head tube will now be at a much steeper angle.

I recommend doing a bit of google work on "rake" and "trail".
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Old 12-11-09, 10:51 AM   #5
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Is anybody going to mention that it also looks like a 1 1/8" threadless fork, and a bike from the 90's will require a 1" fork?
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Old 12-11-09, 10:54 AM   #6
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Is anybody going to mention that it also looks like a 1 1/8" threadless fork, and a bike from the 90's will require a 1" fork?
was just going to say that, finally clicked on the images...
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Old 12-11-09, 02:37 PM   #7
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thanks for kind replies and advices.
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