Fork setups...Enough already!!! - Page 18 - Stunting Help and Advice

ajax · 07-11-2008, 02:53 AM

I’m new here and to stunting (squidward)

nice thread, I’ve been chewing through it from the start for maybe a week now. As I read, I would want to respond with an answer or a question that had been prompted by the posts, consistently someone posted my thoughts, so maybe I have a chance with this group.

I was comparing the 929 and F4i forks and found that the small dia. axle side of the 929 is the same dia. as the large dia. axle side of the F4i. What that means is I could put both fork legs on one axle (centerline) for precision length comparison. I measured (tape measure) an approximate 29.625” for the F4i leg from axle center to top side of fork cap. That dimension accurate or not, all my other dimensions are with in say, ten ‘thou of absolute length. I read some “this one’s longer than that” but so far I just found one post with lengths of the two and it sounded like tape measure approximations (which is okay). So I wanted something more exact. All my measurements hereafter are digital caliper drawn (Nags trick). The 929 leg measured 1.600” shorter axle center to top side of fork cap) than the F4i, making the 929 length 28.025”

929 and F4i use the same steering stem nuts (the goofy spanner nuts) I think. When both are tightened on the same frame (F4i) the top side of the top spanner nut should be the same relative location to the frame (i.e. same size top bearings will clamp down to same height). The top spanner nut is the point of origin for the comparisons.

929 and F4i top triples get bolted tight against the top side of the top spanner nut (the “zero” plane).

Length above zero when top of fork mounted flush with top of triple (929) or clip-on (F4i)

929 - 0.118
F4i - 1.835

F4i Axle to top side of fork cap 29.625

929 Axle to top side of fork cap 28.025

F4i fork length below zero (29.625-1.835)=27.790

929 fork length below zero (28.025-0.118)=27.907

929-F4i (27.907-27.790)=0.117

The 929 has 0.117” more fork length below zero (is longer). Combined with the 929 “sprung” for a heavier “racing” bike and newer more advanced, stiffer and not as droopy as the saggy old F4i mediocre street bike for 135-man. Both forks on a given bike I would expect the 929 forks to be noticeably taller in the front.

You guys convinced me to respring my F4i’s, my 1.0 racetech’s arrived today :-D got a lot of work just to get mine running, then the hazing ritual to get the Everett Dawgs ta leme ry wid’em

I have photo's (too wide), I would rework & post or email em if interested

1/8”, I could’ve just said 1/8” taller

just a thought F4i with db bars, drop the forks flush with the triples...yeah that’s taller...can you endo a chopper?

Question: for a given skill level will the bigger bikes roll farther than a 600 (inertia) practical, not theoretical crap.

ajax · 08-09-2008, 01:37 PM

fotos

07-11-2008, 02:53 AM	#341
ajax Registered User Join Date: May 2008 Location: everett, wa, usa Age: Bike: f4i Gender: Male Posts: 6	Re: Fork setups...Enough already!!! I’m new here and to stunting (squidward) nice thread, I’ve been chewing through it from the start for maybe a week now. As I read, I would want to respond with an answer or a question that had been prompted by the posts, consistently someone posted my thoughts, so maybe I have a chance with this group. I was comparing the 929 and F4i forks and found that the small dia. axle side of the 929 is the same dia. as the large dia. axle side of the F4i. What that means is I could put both fork legs on one axle (centerline) for precision length comparison. I measured (tape measure) an approximate 29.625” for the F4i leg from axle center to top side of fork cap. That dimension accurate or not, all my other dimensions are with in say, ten ‘thou of absolute length. I read some “this one’s longer than that” but so far I just found one post with lengths of the two and it sounded like tape measure approximations (which is okay). So I wanted something more exact. All my measurements hereafter are digital caliper drawn (Nags trick). The 929 leg measured 1.600” shorter axle center to top side of fork cap) than the F4i, making the 929 length 28.025” 929 and F4i use the same steering stem nuts (the goofy spanner nuts) I think. When both are tightened on the same frame (F4i) the top side of the top spanner nut should be the same relative location to the frame (i.e. same size top bearings will clamp down to same height). The top spanner nut is the point of origin for the comparisons. 929 and F4i top triples get bolted tight against the top side of the top spanner nut (the “zero” plane). Length above zero when top of fork mounted flush with top of triple (929) or clip-on (F4i) 929 - 0.118 F4i - 1.835 F4i Axle to top side of fork cap 29.625 929 Axle to top side of fork cap 28.025 F4i fork length below zero (29.625-1.835)=27.790 929 fork length below zero (28.025-0.118)=27.907 929-F4i (27.907-27.790)=0.117 The 929 has 0.117” more fork length below zero (is longer). Combined with the 929 “sprung” for a heavier “racing” bike and newer more advanced, stiffer and not as droopy as the saggy old F4i mediocre street bike for 135-man. Both forks on a given bike I would expect the 929 forks to be noticeably taller in the front. You guys convinced me to respring my F4i’s, my 1.0 racetech’s arrived today :-D got a lot of work just to get mine running, then the hazing ritual to get the Everett Dawgs ta leme ry wid’em I have photo's (too wide), I would rework & post or email em if interested 1/8”, I could’ve just said 1/8” taller just a thought F4i with db bars, drop the forks flush with the triples...yeah that’s taller...can you endo a chopper? Question: for a given skill level will the bigger bikes roll farther than a 600 (inertia) practical, not theoretical crap.