Everything! A tire that is on "nominally" the correct width rim like say 185 on a 5.5 inch rim is as the tyre manufactured it for road use. Stick the same tyre on a 6 or 6.5 inch rim no problem, but it LOOKS much fatter and wider. It also has less sidewal flex so feels more accurate and instant without as much "slop" as it flops over when going left / right. More suited to hard cornering or racing. And the correct pressure is now higher to achieve even tread wear, so even better feel and feedback. But the rims hit the curb before the tyre, and the road noise is increased, and the harshness goes up!
Doing things the other way around, wide rubber narrow rims is a bit like sailing a boat!
The rims on my van
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are 17 x 9 where 17 x 8 was advised by the tyre manufacturer for the 225 tyres. This was my cornering compromise! But the widest part is now the wheel rim! Too close to a curb, and bye bye wheel!
Because i raced and broke everything and now I am old... And thats not me it one of my carers (one bloke for jobs like that 2 girls for trips to the pub etc...) I cant reach it I am stuck in a wheelchair after a nasty bike/ditch incident.
It grew on its own outside and all I did was water it a few times. It got to about double that size but I left it out all winter and it expired. Looks like a xmas tree in feb now...
Would drilling holes in alloys to suit 4x100 fitment be a silly idea? I've seen some Porsche split rim alloys for sale but they are 4x108, There are plenty of alloys out there with multi fitment but I guess they are engineered to take the stress?
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