[Closed] 150mm air forks on a 140mm max frame- temporary/lower the psi?

It'll be alright, but your weekend work will be the ideal option.....

I ran some forks at about 50% sag on our tandem! Was a bit wallowy.....much better now ive 'the right' forks on it!

DrP

My head says wait/do it properly as it'll feel horrible my heart says rush/bodge it impatient 8)

Unless it's a very spindly frame 10mm wont break anything, it may push the handling out a bit but not that much. As you say it's not a long A2C fork so it may be fine anyway. Does the 140mm Max come with any A2C data - otherwise it's just guidance.

AC is 528mm

Is that of your fork or the one the frame was declared 140mm against?

I have a t120 whyte and rang them about running a longer fork and they said anything up to 20mm longer on any frame would be fine and it would invalidate my warranty. Specific to Whyte I know but seems likely you will be fine.

I'd put 120s on it Mark. 😀

528 Thats my fork (actual). Scapegoat the Thors A2C is 520. How long has your lad ran them at that? Me thinks its too much even that 8mm difference.

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.

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...

Just get over it as it'll make the square root of F all difference

I think the max fork length is now determined during the CEN tests?

Just get over it as it'll make the square root of F all difference

If the F means **** then +1

hora you are taking the piss aren't you? 10mm will make **** all difference!!

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)

I'll wait.

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.

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...... 😀

My 120 Reba's for sale if you want it......

Can't afford I've just bought some new carpet too 🙁

i had a hardtail that should have had a max of 120mm....so i stuck a 150mm marzocchi on there....ran it like that for about 3 years without any issues...

What hardtail was it?

Some I definitely would, some I wouldn't (rightly or wrongly).

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...

[url= http://i919.photobucket.com/albums/ad37/gonzy1/540342_3929449878445_170560153_n1.jp g" target="_blank">http://i919.photobucket.com/albums/ad37/gonzy1/540342_3929449878445_170560153_n1.jp g"/> [/img][/url]

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...

Cy at Cotic says the 140mm max for the Soul is based on Travel, and not A2C height - I'd have though a long fork (a 36 at 140mm, for example) would cause more stress issues than a revelation at 150mm.

I see your point(ish)

Float, Talas, Van 160: 545.3mm

...but a Fox 36 at 140mm would only be 525.3mm?

So a 150mm Sektor air is 3mm higher but 10mm longer travel v the 140 36's.

hora...my current frame has 140mm travel at the rear and should run with a 150mm fork but its running 170mm at the front without any issues...i notice a recurring pattern here with me and long travel forks!! 😉

Why not email Cy........?

because he rides a commencal

I ran Talas 150-130-110 on my Mk2 Soul and it's still in one piece.

i ran 140mm pikes on a mk1 trance - 80/100mm!!

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.

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.

Wouldn't worry. You won't have the frame long enough to notice any difference anyway.

😆

10mm, 8mm, 3mm, whatever the actual A2C difference is will make zero difference to anything, I would doubt you would notice any difference at all, set the sag in the correct way to get them set up & ride it.

10mm, 8mm, 3mm, whatever the actual A2C difference is will make zero difference to anything, I would doubt you would notice any difference at all, set the sag in the correct way to get them set up & ride

Good point. Lets do this 'mutha