Steve Lovelock
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| posted on 30/5/10 at 08:13 AM |
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Tyre change 195/45/15 to 195/55/15 - is it worth it?
I have a Luego with 195/45/15 rear tyres and the gearing is to low, ie I end up doing 3000 rpm in top at 70 and I would like to be doing much less.
If I change to 195/55/ 15 would it make much difference?
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ReMan
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| posted on 30/5/10 at 08:21 AM |
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http://www.tyresave.co.uk/tyresize.html
7% difference of 3000, so not a lot really
[Edited on 30/5/10 by ReMan]
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matt_claydon
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| posted on 30/5/10 at 08:22 AM |
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7.2% difference in rolling circumference will give you 2780 rpm at 70 with the bigger tyres.
Edit: Too slow 
[Edited on 30/5/10 by matt_claydon]
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ashg
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| posted on 30/5/10 at 08:25 AM |
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its a 7% difference
at 70 you will be doing 74.9mph
2790rpm down from 3000rpm
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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RazMan
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| posted on 30/5/10 at 08:39 AM |
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I just changed my rears from 245/35/17 to 245/40/17 and although the difference is only small, it made quite a difference to my revs - 1st gear
becomes a useable gear and 5th is now almost an overdrive.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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mcerd1
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| posted on 30/5/10 at 09:34 AM |
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7% might not be much, but its as much as changing the diff ratio by one step 
eg. 3.62 -> 3.38 = +7%
-
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MikeRJ
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| posted on 30/5/10 at 09:36 AM |
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quote:
Originally posted by Steve Lovelock
I have a Luego with 195/45/15 rear tyres and the gearing is to low, ie I end up doing 3000 rpm in top at 70 and I would like to be doing much
less.
Much higher gearing is going to put a dent in performance. 23.3mph/1000 RPM in a 7 seems like pretty tall gearing already?
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omega 24 v6
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| posted on 30/5/10 at 10:14 AM |
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Also be aware that if your front wings are close to the tyres now then they may be touching when you go up a profile. DON'T ASK
If it looks wrong it probably is wrong.
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MikeRJ
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| posted on 30/5/10 at 10:18 AM |
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Also note that 195/55R15 is a significantly more expensive tyre size than 195/50R15.
[Edited on 30/5/10 by MikeRJ]
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