Bicycle Mechanics - what kind of difference will i notice with this fork change
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09-09-10, 10:12 PM
I am going to buy a surly steamroller frame and fork, however I want a front disc brake. So I found a fork that I think would work well, but it is slightly different.
The noticable changes I can see are:
Rake from 38mm to 45mm
Axle to crown height from 368mm to 395mm
What kind of difference will this make to the ride?
It will make the steering more sluggish, or stable if you prefer.
09-10-10, 05:29 AM
Thanks, would it be by a huge amount?
.. would it be by a huge amount?
Can't really be answered. Some people are, or claim to be, very sensitive to changes like this. Others are more robust. The bike will still remain rideable, no doubt about that.
If it was mine I'd probably go "Hmm, different" on the first ride then promptly forgetting all about it 15 minutes later.
Your wheelbase will be lengthened slightly thanks to all that extra rake, your bike's front end will sit an inch higher, which will serve to increase trail (a stabilizing effect) as the frame geometry rotates about the rear axle and thus slackens both seat and head angle slightly, but the extra rake may null any trail you might have gained.
It's hard to know exactly what the net effect will be but you might not like how high your front end sits after changing to that fork.
09-10-10, 09:39 AM
As nhluhr explained, the increased length will in effect slacken the headtube angle and increase trail while the increased rake will reduce trail so the two effects will tend to compensate for each other. I expect the net effect will be relatively minor and you will get used to the bike's handling fairly easily.
09-10-10, 10:05 AM
I agree. It will cause a minor change due to the two different dimensions cancelling eachother out.
Don't sell you surly fork until you are sure you like the new one... then you can swap back if you don't like it.
09-10-10, 09:05 PM
thanks. I haven't yet bought the frame, so will probably try it out with the new fork straight away.
09-10-10, 09:13 PM
You'll also probably get about a centimeter higher bottom bracket, so less likelihood of pedal strike.
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