mountain bike tire question

I am having hell keeping the tire from spinning on the rim and yanking the valve stem out on my wifes bike. I have tried scuffing up the rim and tire bead so that the tire would hopefully grip the rim better and running the pressure closer to the high end but nothing seems to be working for me. Are there any tricks to keep the tires from rotating on the rim?

 

tubeless

 

That would be awesome but I was looking for something to do tonite for a ride tomorrow.

 

rtv on the tire/tube?? is it a presta or schrader stem?

 

What pressure are you running and what is the rim made of? Could pressure be a bit low or tyre old and effed? A new tyres bead should lock into the rim with even modest pressure.

 

For tonight, fold a layer of duct tape over itself and place between the rim and tire where they seat.

 

They are schrader stems, aluminum rims and the tires are Michelin Country Rocks. Basically bike path tires but they are in good shape and only a few years old. Tires say 36 to 73PSI on the sidewall. I have gone up to 60PSI and they still seem to slip.

 

More pressure

 

Ive gotta ask, are they the right size tire/rim combo??

 

Won't help for tonight, but take the tire off the wheel and give them both a good cleaning at the bead. Put it back together and give it a go. The tire is probably about done, even if the tread looks OK. Scuffing the tire and rim won't do anything to help the issue, get them as clean as you can. If you're riding off pavement at all, I wouldn't go to 60 psi. If all on pavement, I wouldn't really go above 60 psi. A fresh tire is your best bet either way.

 

spend a couple dollars on the correct sized tire.... 650 is not 27.5

 

Thanks all. Once this blows over I will get new tires for her bike. I cleaned the shit out of everything and reassembled with the duct tape wedge and hairspray on the bead to glue it down at the recommendation of another friend. We will see if it worked tomorrow.
And what was that 27.5 talk. We are still rollin' on 26's yo!

 

Was gonna recommend hairspray, like used on Moto grips.

 

Hair spray or a few dots of caulk/RTV between the tire bead and rim.

 

It was an old MX buddy that reminded me of that. You must be old too. That is from back before the days of grip adhesive...

 

How much horsepower does she put out?

 

Maybe try https://www.walmart.com/ip/Zefal-Tu...MIufTl4rrJ6AIVrYFaBR3Ksw1fEAQYAiABEgJanvD_BwE

 

60 psi in a bike tire, and slipping on rim? road race tires are held on with often as low as 20psi on 140+ hp bikes.. As someone stated, are you sure it's the right size?
I know i'm runnin 20psi in rear on my Ebike, and we have a few hills and steep climbs on the trails here in FL (old mining areas that are now parks)

 

I've seen this happen on several bikes that come into my shop.
When pressure gets below 20 and brakes are applied, the rim will stop but the tire does not.
Most common on shitty rims that have way to much clearance between bead & rim.
I suggest you let all the air out and see what kind of gap there is.

 

We run 8psi for dirt track.