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Can I 175?

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#1 Coleco82

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Posted 15 March 2014 - 02:06 PM

Hi Guys, perhaps someone can help, I have a 2000 TDDI, its fitted with standard tyres 185 65 r14, I have been offered a set of 175 65 r14, any thoughts?

 

Thanks



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#2 Captain Haddock

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Posted 15 March 2014 - 07:56 PM

Dropping down to the 175s will mean the overall diameter of the tyre will decrease by 2.18%, but that's within the generally accpeted limit of +/- 2.5%

 

This means your speedo will over-read; i.e. the speedo will show a higher speed (1.1%) than the car is really travelling at and you'll use more fuel to travel a given distance.  Examples :-

  • At an indicated 30MPH you'll be doing 29.7MPH
  • At an indicated 60MPH you'll be doing 59.3MPH

You should also inform your insurance company if you decide to use the 175/65R14 tyres because if you don't and are involved in an RTC (Road Traffic Collision) the insurance company will have a very good reason to declare your insurance invalid; then you get done for driving without insurance, no money for the damage to your car and you'll have to settle the other party's damage claims yourself.



#3 jeebowhite

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Posted 15 March 2014 - 08:57 PM

couldnt say any more than Rob really, he hit it on the head :)



#4 Coleco82

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Posted 15 March 2014 - 09:42 PM

Will the car still handle ok? i can't see any with 175s ?

Thanks for the info btw

 

Steve



#5 Simon R

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Posted 15 March 2014 - 10:17 PM

Why will the width of the tyre alter the speed surely it would be the wall size ie 65s down to 50s

#6 jeebowhite

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Posted 15 March 2014 - 10:42 PM

Fair point there Simon! I think perhaps both myself and Rob may have been referring to the profile depth rather than the tread width in the 175.

 

In which case, my only concern would be, would a 10mm thinner tyre still sit the same on the same wheel? as long as this isnt a problem them it should be fine, but of course, you have lost some surface area, so handling would be reduced.



#7 Simon R

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Posted 15 March 2014 - 10:48 PM

Yes if he retains 65s the speedo should be fine

#8 AdeMk1

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Posted 15 March 2014 - 11:04 PM

Yep, the 175's will be fine and will fit on the rims no problem.

Handling shouldnt really be affected as long as your not into cornering like Colin McRae, which i doubt :)



#9 Coleco82

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Posted 15 March 2014 - 11:08 PM

I'm no rally driver just concerned about stability and death


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#10 jeebowhite

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Posted 15 March 2014 - 11:25 PM

Well, if your not going to push the car round corners, then it should be fine, you shouldnt really notice anything, but to be honest you shouldnt have anything to worry about.



#11 Coleco82

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Posted 15 March 2014 - 11:26 PM

Will they fit only rims ok ?


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#12 mixmasterlooney

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Posted 15 March 2014 - 11:35 PM

What about load bearing and speed rating are they the same? Smaller tyres maybe for smaller cars and have rated speeds slower than your car can go

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#13 jeebowhite

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Posted 15 March 2014 - 11:35 PM

I shouldnt think it will be an issue, as the steel band expands anyway...



#14 turbohater

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Posted 15 March 2014 - 11:41 PM

65% of 175mm  is less than 65% of 185mm so the tyre diameters will differ thus affecting the speedo readout



#15 Nighthawk

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Posted 16 March 2014 - 01:01 AM

65% of 175mm  is less than 65% of 185mm so the tyre diameters will differ thus affecting the speedo readout


Again, 175 is the width not diameter...

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