I'm trying to fit a pair of 2.80/2.50-4 Primo castor tires on my C300 to compensate for the taller drive wheel tires. I'm using the castor forks/tires from my P222. There is slight rubbing on the rear plastic though. Has anyone fit taller tires on a c300? If so, what size? I've adjusted the shocks out fully with the stock castor setup, but it still dips back. The larger P222 tires would make it sit pretty much level I think. Front tires are worn, but size 3.50-8.