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Tyre Aspect Ratio. Can i fit 65's instead of 70's?
Roamingandy
post Wed, 13 Sep 2017 - 21:30
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in the UK i don't really worry about summer/winter tyre changes as the temp is pretty modest and on the few days its really bad i can just not drive. I'm thinking of heading on a road trip to Europe and driving through hot to cold countries with nowhere to store 4 spare tyres, the only option really is all-weathers. one of my current tyres isn't and one ..maybe 2 others are getting a bit past it for a long road trip so i'm looking at getting 4 new tyres

the reviews and tests on these look fantastic, and the price is great too, but the aspect ratio is 65 rather than the manufacturer suggested 70. Vredestein don't make this tyre in a 70, although everything else is the same.

https://www.camskill.co.uk/m138b0s7994p1255..._Noise%3A_69dB#


the official MOT guide says its grounds for a failure if:

a. One tyre is of a different nominal size or aspect ratio to any other on the same axle

which to me reads that its ok as long as the alternate side is the same. i'd imagine that the difference is less than having one worn tire and one new anyway, but i wanted to request some experienced opinions before purchasing in case i'm about to get myself into a hole

the vehicle is a 2002 311CDI Mercedes Sprinter and the manufacturers guidance says tyres should be: 195/70 R15. can i legally use them?

thank you
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post Wed, 13 Sep 2017 - 21:30
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The Rookie
post Thu, 14 Sep 2017 - 04:24
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They would be fine (and legal) difference in rolling radius is small (3%) and will only make the speedo over read more, consider also 205/65 where the rolling radius change is just -1%

This post has been edited by The Rookie: Thu, 14 Sep 2017 - 05:32


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samthecat
post Thu, 14 Sep 2017 - 07:46
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I agree with the above but wonder if the OP's insurers would need to be updated?
Would this count as a modification in their world?


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666
post Thu, 14 Sep 2017 - 08:39
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QUOTE (samthecat @ Thu, 14 Sep 2017 - 08:46) *
I agree with the above but wonder if the OP's insurers would need to be updated?
Would this count as a modification in their world?


It might. Better to check now than for it to come to light after a claim. Better still to check before buying thetyres.
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mashman36
post Thu, 14 Sep 2017 - 09:22
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Buy the uniroyal rainsport threes .sell them on same website and are far better and they have them in your size.
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kommando
post Thu, 14 Sep 2017 - 14:39
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When I did this I found the different aspect tyres were an original option on steel wheels where alloys were not fitted so fitted the steel wheels with winter tyres in winter and alloy with summer tyres in winter.
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Roamingandy
post Thu, 14 Sep 2017 - 19:50
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QUOTE (mashman36 @ Thu, 14 Sep 2017 - 10:22) *
Buy the uniroyal rainsport threes .sell them on same website and are far better and they have them in your size.


interesting, thanks for the suggestion. i should mention its a 3.5T van and the forums suggest the Uniroyals might wear out pretty quick with heavier vehicles. i'm trying to find someone else who's used these on a big van to see how they got on
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mickR
post Thu, 14 Sep 2017 - 20:51
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Errrrr your fitting a 91 rated tyre on a 3.5t van???
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Spclexus
post Fri, 15 Sep 2017 - 14:28
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http://www.willtheyfit.com/
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Jlc
post Fri, 15 Sep 2017 - 15:02
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Will it fit is not quite the question.

The load rating should be checked for sure as it will be extremely dangerous if under the minimum listed.

The manufacturer will specify OEM sizes (possibly only one though). Deviation from that will almost require the insurer to be advised.

As Rookie noted, a slightly wider tyre could be an option with the reduced aspect but I believe some owners have kept the same aspect to actually increase the circumference to increase the overall gearing to making cruising more 'efficient'. (well at least a few less rpm's)


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mickR
post Fri, 15 Sep 2017 - 20:26
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QUOTE (Spclexus @ Fri, 15 Sep 2017 - 15:28) *


The tyre size nor the rolling radius are the issue as you will find a combination to fit.
However if you fit 91 rated tyres on a van which should have no less than 102/104 rated maybe even upto 120 load rating you are likely to be in danger of a sidewall failure and an accident, it may also invalidate your insurance and even lead to a prosecution
wink.gif
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glasgow_bhoy
post Sun, 17 Sep 2017 - 09:01
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QUOTE (mashman36 @ Thu, 14 Sep 2017 - 10:22) *
Buy the uniroyal rainsport threes .sell them on same website and are far better and they have them in your size.

+1 Rainsports are the only non-budget tyre I'd ever go for now.
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panther12
post Sun, 17 Sep 2017 - 12:17
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I have the Vredestein Quatrac5 and although only fitted to a small runaround ford ka (165 x 13) I really like them. Never had all season tyres before but on the bit of snow we had last year I was very surprised how well they gripped. From the reviews I read at the time, other all season brands pipped them in normal weather wet/dry but on actual snow got high reviews.
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Spclexus
post Tue, 19 Sep 2017 - 19:56
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QUOTE (Jlc @ Fri, 15 Sep 2017 - 16:02) *
Will it fit is not quite the question.


I agree its just the website name, however i thought the fact that it gives a visual representation of different sizes may help.

QUOTE (mickR @ Fri, 15 Sep 2017 - 21:26) *
QUOTE (Spclexus @ Fri, 15 Sep 2017 - 15:28) *


The tyre size nor the rolling radius are the issue as you will find a combination to fit.


I agree, you can get a lot of different sizes on any given rim to fit, the website gives you the speed error rating for different size tyres on a rim . I thought The extra information would help.


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Jlc
post Wed, 20 Sep 2017 - 15:46
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Yes, useful information - just needed context. wink.gif


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PoFA=Protection of Freedoms Act, SAC=Safety Awareness Course, NIP=Notice of Intended Prosecution, ADR=Alternative Dispute Resolution
PPC=Private Parking Company, LBCCC=Letter Before County Court Claim, PII=Personally Identifiable Information

Private Parking - remember, they just want your money and will say almost anything to get it.
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