That's what I thought. Trying work out if it would be worth it, going through tyres at trackdays and the difference in price between the sizes mean for every 2/3 sets I buy I could get another set in at 16.
£59 for one RSR in 16, £89 for one in 17 from camskill. the difference adds up over a few sets.
Im not hard charging down this route of getting 16s, it's just a case of if it was possible id have a peep because it would certainly enable a few extra tyres over the spread of the year.