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I switch tire after 1000km with Michelin PSS 205/45/17 stock size on my Lusso. It is much better than original tire. My mods are EC ECU Phase 1. EC V4 intake, GFB+ and GWR exhaust. When I full throttle at 3500 to 4000RPM 1,2,3 also with 4th gear traction kick in. Also switching gears at 6250-6500 RPM 1 to 2, 2 to 3, 3 to 4 same problem, traction kick in. This happens with slippery roads. In my city most of the road surface is slippery. Is it good idea to switch tire to 235/40/17 which is too similar diameter with original tires? Or because of HP and TQ increase I need bigger diameter tire Which can be 225/45/17. I checked mx5 forum some say okey some say it is rubbing for 235/40/17. Also I have only 2 option for this dimension tire Hankook Ventus v12 EVO2 k120 or CONTISPORTCONTACT 5. Which is more grippy?
 

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Conti 5P (not 5) and Conti 6 are real “gumball” soft. Great rubber. Wear fast though.
 

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I am currently running 225-45/17 sumitomo HTR-Z III tires on TR Motorsports FF-10 17x8 wheels without any clearance problems on an abarth with stock suspension....
 

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From the GoodWin Racing site:

17" Wheels

With stock size 205/45/17 tires you can run offsets as low as 40mm and still fit in factory fenders with 1 degree negative camber or better, we have run 38mm with more camber. An easy upgrade in 17 inch is 215/45/17 and that fits with our wheel choices that are 42mm to 50mm offsets.

MAX TIRE SIZE that will fit in stock fenders without a fender roll is 235/40/17 using our Advanti Racing, Konig HyperGram, and 6UL Racing Wheels in either 17x8 or 17x9, as long as you have about 1.5 degrees of negative camber or more. If the car is lowered and/or raced, this size will typically rub the plastic fender liners inside the wheel well at full steering lock and/or over big bumps/dips in turns depending on amount of lowering and amount of negative camber (same story with taller 225/45/17). This is all even more true for 245/40/17, which can be used by SCCA STR competitors with a fender roll. Picture here is our own Fiat 124 with our 17x7 Bronze 6UL wheels and 255/35 tires, and lowered with KONI SPORT shocks and our Race Spec Springs. .


http://www.good-win-racing.com/Mazda-Performance-Parts/Fiat124/Wheels-Tires.html?id=DfKRkqj9
 
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Maybe moderate that right foot a bit? After all, you're just wasting energy spinning the back wheels. There is zero cost to that option.
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Best regards
Pete
 
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