HarleyFDMD Posted December 12, 2016 Share Posted December 12, 2016 For example.. The top picture shows a 225 40 18 The bottom picture shows a 305 30 18 The 305 30 actually has a larger depth sidewall than than 225 40 due the the overal percentage. But using your statement you'd say that the 30 profile tyre is bad because it doesnt have enough 'squidge' even though it has more than the 40 profile tyre which you say is good? Do you get what im saying? Quote Link to comment Share on other sites More sharing options...
David P Posted December 12, 2016 Share Posted December 12, 2016 (edited) You cant paint all tyres with the same brush regarding sizes though. The profile size is a percentage of the width.. therefore a 295 30 18 wont have the same side wall depth as a 225 30 18 thus making your coment completely redundant? I may be wrong here and i dont claim to be any sort of tyre size genius but i dont understand how you can say 30 profile tyres are bad without also stating a width? /QUOTE] Wider tyres require wider wheels and because deep dishes are trendier than correct offsets is where it can soon wander into tits-up territory. Edited December 12, 2016 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
David P Posted December 12, 2016 Share Posted December 12, 2016 (edited) Increasing the width of the tyre does increase the sidewall height, but that is just one element. Suspension travel alters the wheel/road angle and regardless of regained tyre sidewall height and final gear ratio, the "lateral" squidge is proportionally less with a 30 than it is with a 40, which can result with lack of road contact for the outer and/or inner edges by up to 50mm of tyre road contact. Incorrect wheel offset exaggerates this. Lowering more than 10 - 15mm exaggerates this. Incorrect geometry exaggerates this. Edited December 12, 2016 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
HarleyFDMD Posted December 12, 2016 Share Posted December 12, 2016 Ok i think im with you, although, if you were to run a 295 or above width with a 40 or above profile, the sidewall would be huge? Which as you say may well aid traction but surely that jeopardises the handling capabilities in the bends? Quote Link to comment Share on other sites More sharing options...
David P Posted December 12, 2016 Share Posted December 12, 2016 (edited) Chris may soon pop up and say similar things, yet with the correct technical terminology? I run 285 40's on 18's, which is max width for my 10" Borbet TTE's, they have the correct offset and everything fits perfectly with a minor lip trim. (275 40's fit without trimming) With an N/A 4.083 Torsen diff, this wheel tyre combo gives near as dammit same ratio as 3.769 T.T. auto stock wheel/tyre sizes. Edited December 12, 2016 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
ashloys Posted December 12, 2016 Share Posted December 12, 2016 I actually really like that look David. Maybe 295/35/18 will work for me then? Ideally I want them to look like this below: Quote Link to comment Share on other sites More sharing options...
David P Posted December 12, 2016 Share Posted December 12, 2016 Addiction to form over function is not a quality of mine. Quote Link to comment Share on other sites More sharing options...
HarleyFDMD Posted December 12, 2016 Share Posted December 12, 2016 Addiction to form over function is not a quality of mine. You did trim your arches though.. [emoji12] Quote Link to comment Share on other sites More sharing options...
David P Posted December 12, 2016 Share Posted December 12, 2016 That form serves a function. Quote Link to comment Share on other sites More sharing options...
David P Posted December 12, 2016 Share Posted December 12, 2016 (edited) :d He has a point David, perhaps you are too old and knackered for a Supra these days Traversing rumble-strips on 30's is like a hammer drill to my spine. Maybe 6 herniated discs have given me superpowers to recognise tyre profile and tread pattern via my coccyx? Edited December 14, 2016 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
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