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Old 8th October 2007, 18:00   #1
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Default 205/55/15 Vs. recommended upsize for 195/60/15 tyres

Hi

I am interested in upgrading the stock tyres on my Cedia to Yokohama S.Drive. Having gone through the parked threads and used the tire size calculator, have arrived at the following numbers:

Stock Tyre: 195/60/15

Sidewall (mm): 117
Diameter (mm): 615

Option 1 (recommended): 205/60/15

Sidewall (mm): 123
Diameter (mm): 627
% change in diameter: +1.95%
Speedo error: 2% (reads slower)

Option 2 (not-recommended): 205/55/15

Sidewall (mm): 112.8
Diameter (mm): 607.5
% change in diameter: -1.22%
Speedo error: 1.4% (reads faster)

Option 1 is the recommended upsize based on iraghava's excel sheet. However, it is Option 2 that is actually available for S.Drive.

I would like to know:

1. Will the reduced ground clearance (4 mm) due to using Option 2 have a serious impact on everyday driving, especially under "fully loaded" situations?
2. Is it wrong to change tyre size which leads to reduced diameter, even if it is within permissible limits (<2-3%). What would be the disadvantages of this configuration? Reduced comfort (4mm reduction in sidewall thickness)?

I would like to weigh the demerits of choosing Option 2 for S.Drive Vs. buying 195/60/15 for Michelin PP2 (which is the correct size but costs more per tyre. Also I am not sure if any incremental performance gains for the PP2 justify the cost FOR ME given that my driving style may not require it. Would like a tyre biased towards handling/performance though )

Would love to hear from the experts on this - I wasnt able to see the above issue specifically addressed in any of the threads, Mods - please do point me in the correct direction and close this thread if I have missed it

Thanks
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Old 8th October 2007, 18:46   #2
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Got my Petra a new set of tyres, yoko's S drive, 205/50/R15. And I can vouch for the ride and handling part. I have not found any difference in ride quality after upgrading from my stock tyres(175/65/R14).

Michillin PP2 are expensive( Rs800 more per tyre) and may be better in terms of Performance/Noise reduction.
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Old 9th October 2007, 16:15   #3
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Quote:
Originally Posted by Flying Bong View Post
Hi

I am interested in upgrading the stock tyres on my Cedia to Yokohama S.Drive. Having gone through the parked threads and used the tire size calculator, have arrived at the following numbers:

----------

Would love to hear from the experts on this - I wasnt able to see the above issue specifically addressed in any of the threads, Mods - please do point me in the correct direction and close this thread if I have missed it

Thanks
mate try out this link
Tire size calculator
it helps you in calculating...hope it helps u
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Old 9th October 2007, 17:45   #4
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I think the correct upgrade should be 205/55 R15.

I dont think so the Cedia would have much of an impact while upgrading to the new tyres which reduce the ride by 4mm. But in the case of full load, I'm not sure. Perhaps some BHPian who has upgraded his Cedia's tyres can comment on this.

EDIT: reignofchaos had upgraded his Cedia's tyres to 205/60 R15, but Michelin Pilot PP2. He could assist on this.

cya
A
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Old 9th October 2007, 19:42   #5
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if handling and performance is one of the main concerns 55 profile will perform better than 60 profile.

4mm G.C reduction should not be a concern at all.
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Old 9th October 2007, 19:54   #6
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dont worry about the 4mm at all, the 55 profile would suit your performance value better.
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Old 9th October 2007, 23:00   #7
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Just make sure the load index is 88 or higher. I use 205/60 PP2 and I'm perfectly happy with them other than a minor tramlining issue on bad roads. Ride quality improved tremendously.
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Old 9th October 2007, 23:18   #8
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Quote:
Originally Posted by reignofchaos View Post
Just make sure the load index is 88 or higher.
Just checked, Yoko S.Drive 205/55/R15 has a load index of 88. Think I'll go for it. Initially, was inspired by many on the forum including yourself ,to buy the PP2, but truth is that I'm really a 'ICE' guy rather than a 'performance' guy, so you can guess where all my spare money will be going...
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Old 10th October 2007, 01:07   #9
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great choice MR.BONG(d) lol! they are a killer set of tires.
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Old 10th October 2007, 13:54   #10
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FB - 205/55 R15 is a perfectly fine upgrade & there is no difference with a GC reduction of 4 mm. It is simply too low a number to have a direct impact on your daily driving.

Also, S-Drives are good tyres so go for them!
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Old 10th October 2007, 14:52   #11
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Quote:
Originally Posted by iraghava View Post
FB - 205/55 R15 is a perfectly fine upgrade & there is no difference with a GC reduction of 4 mm. It is simply too low a number to have a direct impact on your daily driving.

Also, S-Drives are good tyres so go for them!
@iraghava:

Thanks for the advice! Hopeully the swap should happen this Saturday/Sunday

How much can I expect for the stock tires (Bridgestone Potenza RE88) with about 3K kms on them?

Also would like to thank Nitroxx, Reign. and others for responding with their inputs...
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Old 10th October 2007, 15:35   #12
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FB
Expect anything around 1.5k per tyre. Anythin more would be your luck.

Where are u getting the tyres from?
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Old 10th October 2007, 15:48   #13
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Quote:
Originally Posted by kpzen View Post
FB
Expect anything around 1.5k per tyre. Anythin more would be your luck.

Where are u getting the tyres from?
Any Yoko authorized dealer in S.Delhi: BK Tyre (Lajpat Nagar) or South Delhi Tyre (Yusuf Sarai)
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Old 11th October 2007, 18:11   #14
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Default RE: Cedia tyre upsize

Michelin website meantions their MXV8 as the recommended tyre with the size of
205 / 65 R15
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Old 11th October 2007, 20:26   #15
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Quote:
Originally Posted by Flying Bong View Post
Any Yoko authorized dealer in S.Delhi: BK Tyre (Lajpat Nagar) or South Delhi Tyre (Yusuf Sarai)
Correct. These are the two dealers in South Delhi.
I've gone to BK tyre but never to South delhi tyre in Yusuf Sarai.
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