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15" or 17"?
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<blockquote data-quote="6UE5t" data-source="post: 1064072405" data-attributes="member: 103722"><p>Exactly! A 7 inch width can actually fit up to 215 but for 15 maybe not available. If you use 17 then might as well go for at least 215 tyre width. Note that using 17 generally means much heavier rims, hence your acceleration, braking, & fuel economy would be worse. Suspension component will also have to work harder to control it due to the heavier unsprung weight. So unless you want to spend a bit more for lightweight rims, then I don't recommend going for bigger rims.</p><p>For example is the upgrade I have done to my car. Std rims is 16x7 but very heavy, almost 10kg per piece. The rims I upgraded to is 17x7.5 + 17x8.5 forged rims whereby even the wider size only weigh 7kg while the narrower one is only 6kg. So total weight savings on the set of rims are already 13-14kg! Then there's more weight savings from the tyres, around 1kg per piece, so total weight savings from my upgrade is close to 16-18kg despite going bigger rims & tyres, and you can immediately feel the difference when driving it. On top of that of course there's significant difference in grip and handling due to better and wider tyres than std.<span style="color: Silver"></span></p><p><span style="color: Silver"></span></p><p><span style="color: Silver"><span style="font-size: 9px">---------- Post added at 09:11 PM ---------- 6 hour anti-bump limit - Previous post was at 09:02 PM ----------</span></span></p><p><span style="color: Silver"></span></p><p><span style="color: Silver"></span></p><p></p><p>Not really correct. True that to make the car faster you need to make it lighter including the rims but NOT necessarily by using smaller rims! If you buy good lightweight rims then even if you go bigger it can still be lighter! Read my post above. Fast cars need big brakes and a lot of traction, hence need bigger rims, but then have to choose lightweight ones. As for the radius, it can still be maintained the same due to using lower profile tyres, hence the total radius/diameter of the rims+tyres will still be about the same. In fact it can even go smaller despite going for bigger rims, like the my case when upgrading from 16 to 17. The total diameter actually becomes slightly smaller by around 0.5-1cm.</p><p>But I also agree with you that in terms of handling, suspension setup is also very important factor, so on top of upgrading rims/tyres, you can also upgrade suspension using stiffer springs, dampers, anti-roll bars, bushings, etc2, but of course there's the trade-off with comfort.</p></blockquote><p></p>
[QUOTE="6UE5t, post: 1064072405, member: 103722"] Exactly! A 7 inch width can actually fit up to 215 but for 15 maybe not available. If you use 17 then might as well go for at least 215 tyre width. Note that using 17 generally means much heavier rims, hence your acceleration, braking, & fuel economy would be worse. Suspension component will also have to work harder to control it due to the heavier unsprung weight. So unless you want to spend a bit more for lightweight rims, then I don't recommend going for bigger rims. For example is the upgrade I have done to my car. Std rims is 16x7 but very heavy, almost 10kg per piece. The rims I upgraded to is 17x7.5 + 17x8.5 forged rims whereby even the wider size only weigh 7kg while the narrower one is only 6kg. So total weight savings on the set of rims are already 13-14kg! Then there's more weight savings from the tyres, around 1kg per piece, so total weight savings from my upgrade is close to 16-18kg despite going bigger rims & tyres, and you can immediately feel the difference when driving it. On top of that of course there's significant difference in grip and handling due to better and wider tyres than std.[COLOR="Silver"] [SIZE=1]---------- Post added at 09:11 PM ---------- 6 hour anti-bump limit - Previous post was at 09:02 PM ----------[/SIZE] [/COLOR] Not really correct. True that to make the car faster you need to make it lighter including the rims but NOT necessarily by using smaller rims! If you buy good lightweight rims then even if you go bigger it can still be lighter! Read my post above. Fast cars need big brakes and a lot of traction, hence need bigger rims, but then have to choose lightweight ones. As for the radius, it can still be maintained the same due to using lower profile tyres, hence the total radius/diameter of the rims+tyres will still be about the same. In fact it can even go smaller despite going for bigger rims, like the my case when upgrading from 16 to 17. The total diameter actually becomes slightly smaller by around 0.5-1cm. But I also agree with you that in terms of handling, suspension setup is also very important factor, so on top of upgrading rims/tyres, you can also upgrade suspension using stiffer springs, dampers, anti-roll bars, bushings, etc2, but of course there's the trade-off with comfort. [/QUOTE]
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