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Old 13th September 2004, 23:28   #1
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hey guys,

i just got a thought. suppose i change my OE tyres eg. OE tyres - 175/70 R14 and i change it to 185/60 R14.

Does this change affect the kilometer reading on the speedo ? also any effect on the engine RPM ? what about load on the engine due to increased or decreased rolling resistance ?

cheers
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Old 14th September 2004, 00:14   #2
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Your current tyre (175/70 R14) has a height of 12.25cm and what you're planning to put (185/60 R14) will have a height of11.1 cm. So there will be change of 1.15cm as less than what you have now. There should be a change in your speedo reading but really marginal. No change in engine RPM.
I'm pretty confident that there won't be a big difference in rolling resistance. It'll be little more though.
Technically speaking, you should have a better initial pick-up.
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Old 14th September 2004, 01:34   #3
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175/70 R 14 Which car is this?? U sure it's not 175/70 R 13??

Neway.

175/70 R14
Diameter - 23.64 in
Circumference - 74.28 in

185/60 R 14
Diameter - 22.74 in
Circumference - 71.44 in

So technically speaking, when your speedo is showing 100kmph, you'd actually be doing 96.17kmph. Not just that, it will also affect your odometer reading. Imagine yor car has done 10,000 kms, now take 96.17% of this and what do you get, 9,617kms.

So, the resale value of you car will be decided, taking that 10,000kms into consideration, when you've actually done just 9,617 kms.

Personally, i wouldn't reccomed this change.

Here are my options.

1. 185/65 R 14
2. 185/60 R 15
3. 195/55 R 15



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Old 14th September 2004, 12:30   #4
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While Shantanu's calculations are correct, it just looks like theres a lot more happening than there really is.

NC, if you drive fast, which I'm sure you do seeing that you have a nice free flow fitted, these minor issues should not be a problem to you. The benefits of wider and lower profile rubber far outdo the 4 Kmph error in the speedo. BTW, all cars by law HAVE to have a speedo error. They cannot show true speed.

Anyways, the wider rubber and low profile will give you much better handling and cornering. On my old astra, I upsized from the standard 165/80/14 to Falken Z502's - 195/65/14 . It was the single best performance enhancer for that car and I'm sure with good rubber on your car, you will be saying the same.

Also one more point to remember, almost every car in India comes OE with tyres smaller and narrower than the ones sold with the car abroad. This is for the sake of FE. Hence, upsizing, especially a 1 upsize that you have in mind, would probably make your car wear rubber that would have been supplied OE with the same car abroad.

Rt
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Old 14th September 2004, 14:01   #5
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That's true, if that 4% error means nothing to you then it wouldn't really make a diff.

Since the new tyres have a smaller diameter, it will lower the car a bit which will help your car corner better and provide more stability at high speeds.

But don't expect the ride quality to remain the same, that will suffer.

Regards...
Shan2nu
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Old 14th September 2004, 14:23   #6
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yeah,

ride quality is something im not bothered about.

now i have 185/70 R14 on my ikon and am going in for 185/60 R14. the OE on the ikon is 175/75 R14 ( im not too sure )

so is 185/60 R 14 sufficient ? or should i look at 195/60 ?

cheers
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Old 14th September 2004, 14:58   #7
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hey pal i think u must stick to the 185 60 r14 . 1 size upgrade wont cause much of a difference to the car , as too much broader rubbers effect ur FE and the suspension of ur car
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Old 14th September 2004, 15:06   #8
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Well, if you opt for 195s then you might have to go in for broader alloys.

Why don't you check yor tyres and tell us the exact size. That will help a lot.

Regards...
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Old 14th September 2004, 15:57   #9
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shantanu -
Quote:
Originally Posted by [b
Quote[/b] ]now i have 185/70 R14 on my ikon
these are the actual tyres on my ikon. the OE tyres were 175/75 R14 that i got changed at dealership it self

cheers
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Old 14th September 2004, 18:08   #10
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Then go in for 15 in alloys. 185/60 R 15 would be perfect for your car.

If it has to be 14 in then, 185/65 R14.

Regards...
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Old 14th September 2004, 18:26   #11
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While we're at this topic I'd like to know how much can I expect for my stock new Bridgestone tyres that came with the Accent. I asked one nearby shop & he quoted 1000bucks per tyre? Is it right? The tyres have done about 500kms.
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Old 14th September 2004, 22:10   #12
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hey rj i think it is decent enough .
when 1 of my friend got an tata indigo and we had asked them to buy the stock tyres fitted in the car they said they would buy it for 500rs all 5 of them 50kms driven
they were good year tyres 175 / 70 r14.
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Old 15th September 2004, 08:35   #13
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Hey N_C,

185/60R14 on the ikon is perfect for what you seem to be looking for.

Honestly, what makes a bigger difference than tire size is tire quality, ie what make and tread pattern.
If you go all out with ultra-sport tyres you will go insane with the kind of cornering thrills the ikon will provide you with!

Quote:
Originally Posted by [b
Quote[/b] ]how much can I expect for my stock new Bridgestone tyres that came with the Accent
Hey RJK, well i cant tell u abt 500km old tyres, but Rs 2000 is a good price for the bridgestones straight from the showroom....(i think this is the price i managed to get)

bhp, 500Rs for all 5 tyres is ridiculous...i hope your friend didnt take the deal!?

cya
R
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Old 15th September 2004, 11:58   #14
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guys a very fundamental question if you dont mind.

What does the different numbers in 175/70 R13 stand for?
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Old 15th September 2004, 12:27   #15
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Quote:
Originally Posted by [b
Quote[/b] ] 175/70 R13
Good question. 175 (mm) is the width of the tire or how thick it is. 70 is the profile or side profile and is calculated as 70% of 175. 13 is the radius and is measured in inches.

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