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So ive just picked up a Transition Throttle frame which im building up to replace my Sonder Signal ST
The Signal ST was running 130mm Pike Ultimates fitted with 29in wheels, the Throttle originally was designed around 140mm forks and can only take 27.5 wheels
Ive got a set of 29in 160mm FOX Factory 36's with the Grip2 damper with the correct offset for the Throttle sat here which im tempted to chuck on the Throttle but keep the front wheel as a 27.5
Anyone else run a 160mm 29in fork on a Throttle and kept using a 27.5 wheel? does it mess up the geo much?
Its mainly going to be used for XC/Trail/light Enduro
I had one, sold it cos it was too small. Shame because it was a brilliant bike. Just a bit [i]too[/i] bmxy!
As for messing with the geometry, I wouldn’t, especially as 160mm is already 20mm over the travel limit. Guess you could try it.
Geometry etc.
Cheers for the reply
I may chuck them on and see how they feel, worst case i can always sell them and get some 140mm 27.5 ones
Just to check - this is a frame for 27.5” wheels and a 140mm fork? Personally I wouldn’t run a 160mm travel 29er fork on that - most 29er forks are longer than the equivalent 27.5” one for any given travel.
So really you’ll probably be wanting to run that 29er fork at 130mm travel with a 27.5” wheel on it to be close to what was designed. The longer fork and longer travel can exert more leverage on the headtube than it was probably tested for.
Can’t you stick the Pikes from the Sonder on there instead - would make far more sense?
A 160 29er fork is going to roughly give you the geo of a 180 650b fork. (a-c measurement usually 20mm longer for the 29er version)
So it will feel like riding a 180mm (650b) fork thats set up a bit too stiff.
The bike's designed for a 140 fork, so you are adding 40mm of front end height (plus a bit more for the effective reduced sag) which is going to slacken the head and seat angle by about 2 degrees, and raise the bottom bracket by maybe 15mm.
(Bar height will go up too but you've probably got enough adjustment with stems and bars to fix this)
29er 130 pikes with 650 wheel will get you close to stock
29er 130 with 29 front wheel would be preferable to 29er 160 with 650 front wheel.
Cheers for the replies
The Pikes are silver so dont really match the rest of the bike, will prob sell them and the 36's and buy some 140mm 27.5 36's
Tempted to try a 140mm air shaft in the 29in FOX 36's and see how that goes as its only £50 for the air shaft and i can give them a lower leg service at the same time
So just been offered a set of 2022 FOX 36 E optimised forks in the correct offset, 27.5 and 140mm of travel at a good price
According to FOX the E optimised use a different damper and the lowers are beefed up, checking online it seems the lowers are 2mm thicker so it uses a FOX 34 damper and air shaft