Hi, thanks for the reply; we went with a 9/80 (equivalent to 10/89) which seemed to work OK - hitting about 18k at the end of the straight. I think we might get away with a couple of teeth more but my son wants to stick with it for the time being... This brings me on to lap times - what are reasonable times for the 100's at Tat please? We started with low 48's but after some radical tyre and chassis changes (and a rapidly drying track), we got fairly consistently in the 45's. We can't do the next meeting because of a family wedding but are loooking to do the December meet so will try to catch up with you there Thanks again Regards Booney
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