the jet rims I use are 130mm outside length, so 120mm inside, I specifically bought 3 sets after we briefly ran with a team, and I realised all my current rims were junk 150mm items...... as soon as I changed them the kart we were running at the time transformed its handling....... I believe this is popular in Honda cadet but I suspect people probably use both 130 and 140......interesting the mustards are 140mm external, thanks for confirming that, so they are still 10mm wider than what I am using.....I have a set of 140's in the trailer with tyres fitted ready to try, as I was thinking I was possibly wasting my time, but looks like its worth a go on a hot day.
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