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I’ve been trying to reach the sidewalls on the skinny tyres of the little 125. After >30 minutes of riding, the rear is warm to the touch but the front is barely off cool.
Thanks to constantly caking them in dirt I also get a fair idea how much lean I’m getting once back on the road. The front patch is barely 2/3 compared to the rear.
I suppose these two things are thanks to the front tyre being in the wind, and the weight and lean all happening at the back.
Scaled up to a real bike, maybe your front just wasn’t warm.
After inspecting my tyres, post-crash, I noticed something potentially interesting...
Bedford Autodrome is an anticlockwise loop, meaning the right side of the tyres get less heat than the left. Both sides of the rear tyres have small heat blisters as you'd expect, but looking at the front tyre only the left side has these. The front right side has none, which could explain it just wiping out when leaning into a right turn.
Is it possible that even after 4-5 laps (& a 20min session) the front wasn't warm enough to handle leaning into it? If so, why was the rear blistered on both sides but the front only is on the left?