Monster Yamaha's Cal Crutchlow has called for a changes to the MotoGP tyre allocation rules so riders can have more soft tyres in their garage because the hard-compound Bridgestones take too long to warm up and are spitting riders off.

Both Crutchlow and team-mate Colin Edwards are nursing broken collarbones after cold-tyre crashes and the former footballer says the warm-up procedure that is required on the spec-tyres is too complex. He was due to bring up his thoughts at the safety commission last night.

"It has happened to everyone. If I was a rookie and I was the only one to crash, then it would be my own fault but when Valentino breaks his leg and he has been here ten years, and Colin breaks his collarbone and he has been here ten years, when Aoyama breaks his back… how many bones do they want broken before something changes?" said Crutchlow.

"At Silverstone, I didn't crash because I was pushing, I crashed for the same reason that everyone else is crashing in this championship: the tyres are not right. I think now there have been more than 60 crashes with these tyres, losing the rear on what they call warm-up procedure. I was three laps in, it wasn't like I'd done two corners and crashed, and the lap before was quite a fast lap. It's always off the gas which are the worst ones you can have.

"They should be made softer but we also need more tyre allocation as we have an extra session this year. On a cold race weekend, where the soft will obviously be for the race, they should give you more of them. We are forced to run the hard tyre because we don't have enough softs in the allocation.

"Every single rider that starts a race with the soft race tyre won't have a spare one for a red flag. We would have to use a part-worn one. What's 20 sets of tyres per race more for the guys in the championship? I would pay an extra €500 for my extra set and so would all the other riders.

"If they're saying we can't change the tyres to help the warm-up procedure then what they need to do, so far as I am concerned, is give us extra tyres so that we are not forced to use tyres we don't want to use. We have a tyre that is so good over race distance but I am sure all the other riders would rather have a safe tyre that is spinning at the end of race. At the moment we have grip at the end of a race but the warm-up procedure is so difficult. It would limit the risk of highsiding off-throttle and breaking bones.

"You have one (a moment) every time you leave the pitlane. It's luck whether you stay on or not, complete luck. I'm not slating Bridgestone in any way because they are a fantastic tyre when they are working they just need to listen to our feedback a little bit more."