Mountain Bike Reviews Forum banner
1 - 9 of 9 Posts

·
Registered
Joined
·
278 Posts
Discussion Starter · #1 ·
I've noticed this issue with my last couple 29ers...

I can move the wheel side to side a crazy amount. I feel when coming into a corner with speed. Im unsure if its A) flexy wheel B) flexy frame C) common with all 29ers...

whats your opinion?


 

·
transmitter~receiver
Joined
·
9,333 Posts
It looks like your frame, especially if you don't feel play like you would in a poorly adjusted hub.
It only takes a few millimeters to detension spokes in a wheel, and if you were doing that regularly, you'd have a taco and not a serviceable wheel.
I can see the stays flexing in your video and that linkage doesn't look very stout at all. Do both chainstays come together into a yoke before attaching to the pivot?
It is not common to all 29ers.
 

·
Registered
Joined
·
2,081 Posts
This is one of the reasons I went back to 26" bikes. My older version RIP-9 had horrible flex in it. Then add in wheel flex and fork flex and you could not hold a line on rocky downhills.

The last 29er I had was a Lenz Behemoth, so frame flex was no issue, but even Flow rims in 29" size have more flex than the same size rim in 26". Plus try to find a 36mm diameter fork, so fork flex is a factor.

My current ride is a Knolly Endorphin, using Sun Ringle Charger Pro wheels, which have a deeper, stronger profile than a Flow, and straight pull spokes going into eyelets and using much higher tensions than Flow rims. This, combined with a Talas 36 fork makes for a bike that goes where you point it even on rough, rocky downhills.

Plus the slack geometry of this bike flat out works everywhere, and does all the things a 29" wheel does. It pushes up over rocks with ease, like a big wheel, and across sand and loose gravel it tracks across it better than the 29er's I have ridden. And yet it drops into corners like a big wheel just does not want to do. The slack head angle gives it all the benefits of a 29er, yet retains all the benefits of a 26er. Win, Win.:thumbsup:
 

·
Registered
Joined
·
278 Posts
Discussion Starter · #5 ·
I def agree there is a little rear end flex going on... I'm sure a 142 rear end would help eliminate that

I'm going to build up either a gordo rim or a p35 and try again...
 

·
transmitter~receiver
Joined
·
9,333 Posts
greenchris said:
I def agree there is a little rear end flex going on... I'm sure a 142 rear end would help eliminate that

I'm going to build up either a gordo rim or a p35 and try again...
I think your rear suspension design is what's causing so much flex.
Changing the rim and spokes is only physically capable of buying you maybe a mm or two, max, depending on your current build.
good luck. :thumbsup:
 

·
Premium Member
Joined
·
48,238 Posts
greenchris said:
I've noticed this issue with my last couple 29ers...

I can move the wheel side to side a crazy amount. I feel when coming into a corner with speed. Im unsure if its A) flexy wheel B) flexy frame C) common with all 29ers...

whats your opinion?


I could make a video that looks like that with my hardtail, and nothing would be flexing.

You have not said if you have checked anything. Spokes, hub bearings, skewers, dropouts (if replaceable), suspension links... any/all could be loose and contributing to slop/flex. Check these before you start throwing new parts at it.

And if your dropouts are not replaceable (no option for that on the Turner site) you can not use a 142mm hub.

It is not a 29er thing. My Salsa Big Mama full suspension bike (20mm front/QR rear) is by far the laterally stiffest bike I have ever owned.
 

·
Registered
Joined
·
278 Posts
Discussion Starter · #9 ·
sunnyside- i love this bike. its the best sultan turner has made. its awesome.

shiggy- bearings are tight adjusted em at work last night. im going to put a park tensionometer to the spokes manana. skewers and the obvious are all tight but will be pulling my shock and getting all suspension bits to rec. torque.

obviously a 135 frame wouldn't accommodate a 142 hub.
 
1 - 9 of 9 Posts
Top