Rear Tire slippage

[Garrick_s]

hello all,

Has anyone addressed the possibility of tire slippage on the rear rim from high torque take-offs.
Im sure with the higher power motors being used, people have seen the tires slipping.
Anyone cut there valve stem off yet? :wink:

I was considering using an adhesive on the tire bead.
Maybe a rubber cement that isn't too permanent.
A rim lock like they use in dirt bikes is too big.

Working on my new build and I am a little concern about this.

 

[neptronix]

A tube slipping internally would seem to only happen if you have the tire massively underinflated.

Anyway i run ~2400 watt peaks from time to time, with a 1.95" wide rear tire and have experienced no traction problems thus far.

The solution is wider tires if you are slipping.

 

[StudEbiker]

I think he is talking about the tire slipping on the rim which can happen with drag cars and things like that, but with a contact patch as small as a bike tire I think this is a non-issue because the tire is going to lose traction WAY before there is enough force to move the tire on the rim.

 

[Drunkskunk]

a good tire/rim fit and propper inflation, it should be just about imposable to slip the tire on the rim.

if you figure you have about 1/4 inch wide rubber contact to each bead, and roughly 80 inches of bead per side, you have 40 square inches of contact of rubber to metal. If the tire is inflated to 60PSI, you have 60 pounds per square inch pressing on 40 square inches of bead. Its just not going to happen.

 

[Garrick_s]

Good points that make sense.

Thanks

 

[medanum6298]

I think he is talking about the tire slipping on the rim which can happen with drag cars and things like that, but with a contact patch as small as a bike tire I think this is a non-issue because the tire is going to lose traction WAY before there is enough force to move the tire on the rim.

I also think so.



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[manitu]

Oh , there's a need , for shure!

Usually happens on the front tire , when braking hard , going downhill.
You know , many pro downhillers runs tubeless tires , wher you dont have the tube holding the tire in place.
The solution: http://www.mountainbikebitz.com/rim-lock-tyre-clamp-p-729.html

.manitu

 

[Alan B]

Usually happens when TIRE PRESSURE IS LOW (even calls this out in their advertisement). Which in some offroad conditions is desired. So I would not worry about it at normal inflation pressure.

 

[manitu]

Sorry , ofcourse you're be right.
I'm just used to run 28-35 psi in the tires on my bike, tires with kevlar bead. guess I'll need a bit extra air with 40-50 pounds heavier bike, and wire beads.
The poitnt is however , they've started making those for MTB rims too.
.manitu

 

[MadRhino]

Low pressure may slip some tires, but they must be hard gum, or almost flat. I used 25 psi for years in Kenda Nevegal sticky or Maxxis Minions on Double track and BFM rims, hard freeriding and never slipped one in the rim, despite tearing knobs off the tires many times. I ride Nevegals as low as 35 psi on my E-ride, they wear in less than 1000 miles under hard riding conditions, yet never slipped a single mm in the rim.

Chose a performance tire, mount it well beadseated in a wide rim, and you can beat it to death without any rim slipping.