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27.5 fork on 26in frame? Trek session

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27.5 fork on 26in frame? Trek session

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flag twitch529
Posted: Apr 8, 2019 at 7:02 Quote
Hello first time posting on here with the weather warming up i have a older trek session 2011-2014 trek session with a coil spring fork. I would like to upgrade it to a air fork. i cant find any air forks for a 26in wheel and finding decent prices on air forks for 27.5in wheels since the travel is going to be the same can i use a 27.5 fork and use my 26in frame and wheel and everything work together? Would having a air fork up front and a coil spring rear shock throw the balance or feel of the bike off? Thanks for all the help in advance
flag Loki87
Posted: Apr 8, 2019 at 16:13 Quote
If it´s not a shitty fork, just stick with coil. Air sucks.
That said, you should be fine with the 27.5 fork on a session as they have a rather low front end. Just check the axle to crown height of the new fork and compare to your old.
You should watch out for the bottom bracket height increase if you end up with a longer axle to crown height, as the Session is allready on the higher side. So see for yourself how much things would change with a specific fork and then decide whether the possible change in geometry is something you´re ok with.
flag twitch529
Posted: Apr 9, 2019 at 3:56 Quote
What makes a coil spring fork better then a air fork for a dh bike i have a air fork on my xc bike and the fork is absolutely amazing thanks for your reply
flag Loki87
Posted: Apr 9, 2019 at 6:59 Quote
twitch529 wrote:
What makes a coil spring fork better then a air fork for a dh bike i have a air fork on my xc bike and the fork is absolutely amazing thanks for your reply

A coil will have less stiction and a linear spring curve progression which makes it less dependant on damping to compensate for the springs shortcomings.
In essence, it´ll be more sensitive to small trail chatter and dive less. It´s simply the more effective spring medium.
Also reliability and service intervals are better for coil.
An air fork has the advantage of shedding a few grams and ease of setup.
The weight is a non factor on nearly any modern fork while riding though, as they all are light enough at this point in time. The differences are literally around the 100g mark.

I´ve changed my Boxxer WC from air to coil and never looked back. Fork feels so much more supple and controled on the trail.
flag twitch529
Posted: Apr 9, 2019 at 7:47 Quote
Okay awesome and i believe it has a 2014 fox 40 fork and the frame is couple years older maybe 11 or something and cant remember the rear shock but its a fox as well im just going to get my frame repainted and then put it back together for the season then thank you for all your help!
flag Loki87
Posted: Apr 9, 2019 at 11:15 Quote
twitch529 wrote:
Okay awesome and i believe it has a 2014 fox 40 fork and the frame is couple years older maybe 11 or something and cant remember the rear shock but its a fox as well im just going to get my frame repainted and then put it back together for the season then thank you for all your help!

If you wanna really get some top performance from the thing, get an avalanche cartridge for the 40 or at least a newer 40 cartridge (if compatible) if the outers are still in good shape.
You´ll end up with the best fork on the market.
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