Come on then brainiacs, give me a fix for this

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My new-to-me 1990 Orange Clockwork has a problem. The tyres spin in the rims under braking. Ive taken it for precisely two little test rides up the road and back, nothing radical or remotely challenging. And when i get back both valves are at 45 degrees, evidence that the tyres are slipping on the rim under braking. Ive tried just wiping the surfaces with degreaser but this hasn't helped at all.

Rims are Mavic 231s. Tyres are Panaracer Rampage 2.1 and 2.3 with kevlar bead.

Got any ideas?
 

Gunk

Guru
Location
Oxford
What pressures are you running?
 

sevenfourate

Devotee of OCD
100% sure tyres are correct size for rims - and of the right type for those rims ? Ie: Is the bead of the tyre seating and locking into the rim properly. As clearly it can’t be from what you’re saying……
 

Drago

Legendary Member
Alloy rims? Dismount the tyres and clean the, rough up the mating surface on the inside of the rim try again.

Useless fact - this used to happen under acceleration on early versions of the MG Metro turbo.
 
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lazybloke

Today i follow the flying spaghetti monster
Location
Leafy Surrey
This doesn't help Mickle, but I've also had this problem on a borrowed bike that had solid tyres. I could especially feel the slippage when trying to pick my way down a very steep muddy bridleway (with brakes on hard)

Weird, and quite alarming.
 
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