150mm air forks on a 140mm max frame- temporary/lower the psi?
A compromise question.
Ok I’ve no intention of running 150’s on such a frame mid or longterm and the forks aren’t mazzorchi’s with higher a-c height.
If I ran the forks with slightly lower than normal for my weight psi apart from them being more active there aren’t anymore issues? The theory is the increased sag etc should sit the forks lower when pedalling/actually on the bike etc?
I need to strip the forks down to internally adjust the travel and it wont happen this weekend.Posted 4 years agotymbianMember
My current frame ( Savage Raptor ) is made for 100mm forks but I’m running Zocchi 55’s @ 145, been like it for a year without problems..Welsh trails & trail-centers, road, bridalways etc. And I’m a slim 200lbs.. 😆
I wouldn’t say that it’s ok with every frame though. I paid £30 new for the frame so wasn’t a big concern.Posted 4 years agocanefrogMember
I thought the main consideration in defining a frame’s max fork length was the strength of the headtube to the rest of the frame. The longer your forks, the more likely that the headtube is to tear itself of the rest of the frame under heavy braking or landings. I think the max fork length is now determined during the CEN tests? I might have the wrong end of the stick though…Posted 4 years ago
Normally I’d go +10 or +20mm outside the recommended.
However this is a mk2 Soul frame and its a diddy looking headtube. Ok its steel -visual size doesn’t mean its weaker than a alu bigger looking one but its psychological)
hora you are taking the piss aren’t you? 10mm will make **** all difference!!
I’d normally agree but A2C- the Fox 140 Talas is 510. the RS Sektor air is 528. Thats quite abit of difference even with more sag.
Nope.Posted 4 years agoScapegoatSubscriber
He’s run it like that for a couple of months. He also rides it pretty plush, and with a short steerer/lowish stack. I’d have thought the biggest difference would be to the BB height and related rake/head angle, but back to back comparison is inconclusive. I am not subtle enough /experienced enough to tell the difference in ride quality apart from the obvious difference in weight of the front end.
My 120 Reba’s for sale if you want it…… 😀Posted 4 years ago
it was a base sj26…it was a 14 inch jump frame but still handled pretty well even with a long fork….sadly the frame is gone now as it was also taken when my dh bike got stolen…
that wall has since been re-painted…and the seatpost never sticks out that much when riding…i took the pic like that to demonstrate the length of the post to someone…Posted 4 years agomaxtorqueMember
Whilst it is sensible to have a limit on the length of the fork you should fit to any particular frame, in reality, under any significant impact, the fork isn’t going to be fully extended whilst taking that impact. Added to which, if you are say a 65kg rider rather than a 110kg one, the loads are immediately much lower, even with a longer fork.Posted 4 years agojivehoneyjiveMember
If you were running a 140mm fork at 25% sag, the sagged travel of the fork would be 105mm
Run a 150mm fork at 33% sag and the sagged travel is 100mm, meaning you’re now dealing with just 3mm of needless psychological burden. (105-100mm = 5mm… 8-5mm = 3mm)
Manufacturing and assembly tolerances of axle to crown measurements are usually +/- 5mm anyhow.
Do it and have fun while you’re at it.Posted 4 years ago
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