The tyre fitted is adequate for my vintage trike but lately folk have been singing the praises of Blockley tyres. 130mph rated and designed for cars - the Avon is a sidecar tyre.
I know a racer that uses them and a picture of him going round a bend at Silverstone does not look anywhere near as iffy!
Could be said to be too vintage, make your own mind up: Blockley tyres
