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Old 8th July 2005, 18:27   #1
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Question Tyres for Optra

Hey every one. In a hurry need to decide between the tyres.

Upgrading to 205s. Whats the best upgrade for the Optra. Currently running on 195/55/R15 on pathetic Kumhos Powermax 769. In a hurry to upgrade to 205s. Whats the best upsize for the car. 205s or 215s?? Which tyres. Some please put the calculations. Like what will be the affect in steering or speedometer/Odometer also FE. What profile should i go for on 15inch. Option which i have been given is 205/50/R15 Falkens or Bridgestone Potenza RE711 but they seem too low profile. Another one is 205/60/15 but i dont want to increase the profile. Want to keep it at 55 only. So what to do. WHich tyres. Or should i change profile. Please help.

Thanx Team-BHP in advance
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Old 8th July 2005, 19:07   #2
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Rudra has 205/50 R15 Potenza RE711 on his car. And yes, the ride quality does come down with 50.

I suggest you stick to 195/55 R15 and go in for a diff grand of tyre.

You can even go in for 205/55 R15, won't cause any harm to the suspenssion.

Shan2nu

Last edited by Shan2nu : 8th July 2005 at 19:08.
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Old 8th July 2005, 21:45   #3
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Quote:
You can even go in for 205/55 R15, won't cause any harm to the suspenssion
Thanx Shan. Which brand will i get them in. Are these type of tyres available or not? Will 215 be too wide?? Please give some link for 205/55/15 tyres in Goodyear/Bridgestone or Michelins.
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Old 8th July 2005, 21:59   #4
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[quote=juan] Will 215 be too wide?? [quote]
Dont even think about 215 buddy its way too much for an optra to handle.
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Old 8th July 2005, 22:12   #5
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Quote:
Originally Posted by juan
Please give some link for 205/55/15 tyres in Goodyear/Bridgestone or Michelins.
Here is the Goodyear link
http://www.goodyear.co.in/catalog_in...gory=Passenger

Cheers!!!
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Old 8th July 2005, 23:12   #6
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And here's the "Bridgestone" link.

205/55 R15 87V on 6.5" rims (even 6" will do).

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Old 11th July 2005, 17:17   #7
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Hey Thanx alot Gr8guzzler and shan,

Wanted to know which series does Goodyear have it in. Cheers.

The Goodyear Eagle F1 GSD3s are available only in 16inchers and above according to website. Even the NCT5s are not available in the desired size..??

p.s are they available in India..??
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Old 11th July 2005, 22:54   #8
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Spoke to tyre dealer he says that this size is not imported and he can get me 50 profile. What would be the effect in Odo or speedo or FE after putting wider rubber? Whats the ideal upsize therotically??
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Old 14th July 2005, 17:35   #9
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Question *** help me please

Ohh man Damn no one seems to be of help nowdays.. awaiting peoples help and not getting is the worst part of it :WTF:

Some sweet soul please help me as i am inclined to put 205/55/15 goodyears or Bridgestone potenzas but they arent available in India.. What other option do i have. After putting 205s how much will my ground clearance change? Which tyres are available in INDIA in this size.. Please help since tyres are really very horrible. They were burning badly after some bit of driving..
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Old 14th July 2005, 18:04   #10
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205/55 R15 is the correct size for the optra if u want 55 profile and 15 inchers. 215 will be too wide. Dont go for that. Too wide is as bad as too thin.

Assuming ur car came with 185/65 R14 the ground clearence then was 4.73 inch.

with 195/55 R 15 the clearance wud have been 4.22 inch

205/55 R 15 the clearance will be 4.44 inch . so in effect you will be better off in terms of clearance.

With the 205/55 ur odometer, speedometer etc readings will be within acceptable limits and there is no cause for concern.
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Old 14th July 2005, 18:08   #11
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Dude, your prob is that you don't stick with one tyre. If you feel you need 205 then stick with it and just buy it.

If they're not available in India, then go in for 195/55 R15 (they're good enuf already).

Dunno about Goodyears but, the GIIIs on my car are very silent and grippy.

As for the ground clearence, fitting 205/55 R15 will increase it by 5.5 mm. But, don't think a lot about it as 5.5 mm can be gained or lost with change in tyre pressure.

Shan2nu

Last edited by Shan2nu : 14th July 2005 at 18:11.
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Old 15th July 2005, 19:03   #12
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Question

Thanx Alot Ritik. Car came with 195/55/15s

@ Shan Sticking to 205s but dont know what profile?? 60/55 or 50. 50 will be too low. 55 not available. 60 will be more. Since when you upgrade tyre width you decrease profile. Dont you??

@ Ritik. What will be the effect in Ground clearance and speedo with 205s/50/15? ? Since these are ready available like Rudra Sir has on his car

Last edited by juan : 15th July 2005 at 19:06.
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Old 15th July 2005, 19:25   #13
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Quote:
@ Shan Sticking to 205s but dont know what profile?? 60/55 or 50. 50 will be too low. 55 not available. 60 will be more. Since when you upgrade tyre width you decrease profile. Dont you??
205/60 is not worth it. It's either 205/55 or 195/55.

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Old 15th July 2005, 19:54   #14
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Quote:
Originally Posted by juan
Thanx Alot Ritik. Car came with 195/55/15s

@ Shan Sticking to 205s but dont know what profile?? 60/55 or 50. 50 will be too low. 55 not available. 60 will be more. Since when you upgrade tyre width you decrease profile. Dont you??

@ Ritik. What will be the effect in Ground clearance and speedo with 205s/50/15? ? Since these are ready available like Rudra Sir has on his car

1) With 205/50/15 the effect on Ground Clearance will be that it will decrease by 4.8 mm in comprasion to 195/55/15. The speedo will be 1.6% too fast. So when you are traveling at 100kmph, your actual speed will be 98.4kmph.

2) I totally agree with you that since your car came with 195, a normal upsize would be to 205, however since you cant upgrade the Alloy to 16 inches, options are fairly limited.

3) I dont think going from 195/55 to 205/50 would mean a great decrease in riding comfort as you are already on a low profile tyre and you wont feel the difference that much. For a person going from a 195/70 profile to a 50 profile the difference would be phenomenal, but not in your case so dont worry about the ride quality.

4) The steering will become hard, no doubt about that. But it will take you 10 days to get used to it, and since these days steering are SERVOED, or in other words power steerings.. thus steering become too hard should not be your greatest concern. As with power steerings, hardening effect is minimal.

5) Coming to the choice of tyres, its difficult to find Potenza GIII in your given size. Since you are going for the purpose of looks only (Since I dont think 195 to 205, the road grip or performance will increase that much), thus go for any tyre. The more foreign looking the better. Goodyear has some really great foreign looking tyres like Ventura, NCT5 and GSD 1,2,3. GSD3 are available for 15 inches as well so no worries there. Also you can try Silverstone tyres, they are great to look at.

6) Anyone upsizing, will never be happy with the comfort, as its bound to decrease. But the looks increase sooo much that its worth it. Of course added to that is the gain in performance. The drop in FE is nominal since the rolling resistance increases 10 mm in your case.

7) Go ahead with the upgrade with your EYES closed as you get the jist of how to proceed now. Debating on this forum will not be of much help and further confuse you and make you double minded. Make a decision and stick to it.

8) Finally, dont be mean and use this forum for help and later forget about it when you get tyres. PLEASE POST YOUR CARS PICTURES AFTER THE UPGRADE
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Old 15th July 2005, 21:01   #15
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Thanx alot Aseem. Your post was really very helpful. Now i am upgrading to 205 in 15inchers. Wether its 55 profile or even 50 i dont care much about that since 5 lesser profile wont do much to comfort. If i keep profile 55 then my GC will increase by 5.5mm and if i decrease it to 50 it will decrease to 4.8mm and that means the car will stand at 168.5 mm from ground which i think is a bit less. Since with 173mm GC the car has still touched breakers. Tomorow the tyre dealer will tell me the final tyres which are available after speaking to Bridgestone company. Also 195/55/15s are not available in Bridgetstone. ***.

Also it would be nice if you could list the formula for calculating Ground clearance and Speedo Error. Thanks a million once again.
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