I think you insert them up your exhaust

 

I've just had new rears put on mine. Same F1AS2 as I replaced and there is a massive difference between a worn tyre and new tyre in terms of tread movement

I've done 300 miles so far but still feels loose. The fronts are on about 2.5mm and you'd think they were a different tyre based on how it feels.

Hopefully it will settle down, this is my fourth set of eagle f1s on the back but don't recall this before. I should prob get the geo checked really as it's been 2.5yrs since last time.