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Understanding Pitch?

Old 09-13-13, 10:42 AM
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SamL
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Understanding Pitch?

I'm new to the biking community. I'm interested in purchasing a new fork for my bike. I'm confused on what pitch is. I see it varies for different forks. How do I determine what I have already so I order the correct one.
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Old 09-13-13, 10:45 AM
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Originally Posted by SamL View Post
I'm new to the biking community. I'm interested in purchasing a new fork for my bike. I'm confused on what pitch is. I see it varies for different forks. How do I determine what I have already so I order the correct one.
Crown Pitch: (Leg Width - centre to centre).
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Old 09-13-13, 10:48 AM
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Thanks Barrett, wasn't sure if crown pitch and pitch were the same term.
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Old 09-13-13, 11:28 AM
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Hmmm, when he said "pitch" I thought he was interested in a tuning fork.
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Old 09-13-13, 11:50 AM
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Originally Posted by HillRider View Post
Hmmm, when he said "pitch" I thought he was interested in a tuning fork.
I thought it was checking spoke tension
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Old 09-13-13, 12:19 PM
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My front fork measures out at 107mm (pitch). Not many options out there to choose from. It looks like the next closest is 120. My tire will not fit If I choose a different axle. Anyone know of a company that makes an axle with 107 pitch? Spinner does, but it looks cheap.

Last edited by SamL; 09-13-13 at 02:31 PM.
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Old 09-13-13, 01:27 PM
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Or Thread Pitch , which is how many for a given length.. TPI , or per MM.
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Old 09-13-13, 01:49 PM
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Neve heard of that expression before.
And are you really talking about the axle, or about the OLD, over-locknut distance?
Apart from the occasional small-wheeler and kid's bikes, I don't think I've ever seen anything else than the 100 mm OLD of regular front hubs. Read here for more:http://sheldonbrown.com/gloss_sp-ss.html#spacing

A 107 mm end-to-end q/r axle in an 100 mm hub would be a non-issue entirely. A 107 OLD might need some tinkering. Either seeing if there are some washers that can be removed, look for some thinner locknuts, or simply forcing it into a rigid fork seems like viable options.
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Old 09-13-13, 01:51 PM
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Originally Posted by SamL View Post
My tire will not fit If I choose a different axle.
Please, the tire is the rubber "ring" sitting outside of your rim. It isn't the slightest influenced by what axle you use.
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Old 09-13-13, 02:32 PM
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Ok seems like we got off track a bit. My fork leg to leg measures 107mm not axle I mistyped. Sorry!
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Old 09-13-13, 02:32 PM
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Originally Posted by SamL View Post
My front axle measures out at 107mm (pitch). Not many options out there to choose from. It looks like the next closest is 120. My tire will not fit If I choose a different axle. Anyone know of a company that makes an axle with 107 pitch? Spinner does, but it looks cheap.
Don't confuse pitch which is the on-center distance of the blades at the crown, with (dropout) width which refers to width of the front hub the fork is made for.

IMO - pitch is a fairly useless dimension since the blades and crown are usually inseparable anyway. OTOH it could become material as a guide to tire width clearance --- Pitch - 1 blade diameter (be sure to use the outer blade for suspension forks).
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Old 09-13-13, 06:11 PM
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.......are you absolutely certain you don't mean fork rake ? Which is a useful thing to know.
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Old 09-13-13, 06:22 PM
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Originally Posted by 3alarmer View Post
.......are you absolutely certain you don't mean fork rake ? Which is a useful thing to know.
In post #3 , the OP says he wasn't sure if Pitch and crown pitch were the same, so that probably excludes rake.
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Old 09-13-13, 06:56 PM
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I'm thinking the OP might want to consider a different approach here, wherein s/he says: "I ride bikeX, and i want to replace the fork. What should I look for?"
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Old 09-15-13, 01:11 PM
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Originally Posted by SamL View Post
... My fork leg to leg measures 107mm
At the dropouts where the axle sit?

Measure the hub. The good money is on the hub being the conventional 100 mm, in which case you'll have no problem finding a replaceement fork matching that measurement. However, there's still axle-to-crown, rake, steerer tube diameter and length and threaded vs unthreaded to contend with.
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Old 09-15-13, 03:45 PM
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Originally Posted by surreal View Post
I'm thinking the OP might want to consider a different approach here, wherein s/he says: "I ride bikeX, and i want to replace the fork. What should I look for?"
I agree... We are not getting the information we need to help the OP. I seriously doubt the dropouts are spaced at 107mm. Something isn't right there.

When I read the title I was thinking of chain pitch (1/2", 1", and the rare Shimano 10mm.)
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