normally when you fit a fatter or larger tyre on the back of a blokart you then fit a rear 6.00x6 to the front. blokart make a fork for that

The rules are only there for when you are racing. Otherwise go for it. It's the way we learn more. I've gone back to the skinny tyre on the front because of the bending issue, one issue I have had is turning to quick in sand and the tyre digs in too much....killing speed.

thats not the tyre im familiar with , I thought they were some kind of fancy type tyre with a good solid build up of tread on the side wall

ukkarter said..

landyacht said..

thats not the tyre im familiar with , I thought they were some kind of fancy type tyre with a good solid build up of tread on the side wall

No that's the ribbed tyre I'm using, believe me there's nothing special about the OEM tyre blokart fit as millions of pram owners will testify.

actually the profile of the tyre is important as it maximizes the surface contact area when the wheel leans.
I do recall somebody on the forum waf**ing on about trinometric design or some such word for lots of rubber on the sides.
the profile is not unlike a Motorcycle road tyre for good reason

This is the only rule I can find on tyre size and it only relates to the rear tyre. The 20mm outer diameter rule would probably refer to the standard front as well.

B.9.2 Tyres may be of any manufacture provided that the overall diameter does not differ from those available from BIL (4.00-6) by more than 20 mm (3/4 in) in outer diameter

We have run 12 inch tyres off kids mountain/bmx bikes as well as knobby mini pit bike/ motor bike tyres. They have their benefits and downsides. The knobbies turn much better and are more puncture resistant but lose out on top end speed- better for short course, slower for long runs.

We have also made dual side by side rear axles that take 2 standard rear blokart wheels. They load share well in softer sand and lose nothing on top end speed as only the inners touch the ground with the natural bend of the axles. Not legal to race, but have surprised some with their cornering and stability bonuses. If I have room in my freight , I will bring them to Perth for the World's to trial on the lake's surface on practice days.