Registered Forum User
 Montjuic
    Posts: 55
 Join Date: Dec 2002
 Mood: Waiting for the Sunshine
  
    
     Seen this many times on my race bike (and can be much worse), caused by :
 
 a) Riding too hard on cold tyres - use tyre warmers or  do a couple of gentle laps to start with.
 b)  Rear suspension not set up properly and as a result, the tyres are having to work too hard.
 c) Wrong tyre pressures.