Quote:
Originally Posted by Roman
What i would like to know wil a smaller rim make effect.
For example i now have 185/60R14. I need to replace my tyres, so i will look voor some smaller like 155 and maybe even LRR type (when not much more expensife).
The problem i have now is that my tachometer (or how do you call that thing) give's to much. Like 10% to high. When i drove 100 km there will be 110 on my dayteller. So i need 10% less measure. (correct me if im wrong)
I found a site to calculate it (it's a dutch site) TECHNIEK - BANDENMAAT / TELLERAFWIJKING
So when i go from 185/60R14 to 155/60R13 than it should be ok.
But i could also use 155/50R14.
But which one would better for FE? Lets assume it's the same brand tyre and same type/brand rim.
But the measure wil increase from 71,5 inch to 63,8 inch. So the wheel has to make more rotations for the same distance. When i traveling whit the same speed as used to is it that the engine runs on more RPM (making also more noise) or not? When it makes more RPM for the same speed will it use more fuel?
Good is also that the hight will increase from 57,76 cm to 51,62. That is 6,14 cm zo 3,07 cm / 1,21 inch lower car, think that this would also pritty good for FE. |
This is exactly why I did the regression - to be able to answer such questions. I am disappointed that the OP didn't calculate it for hinslef, but there is a language issue.
So here goes (relatively speaking):
185/60R14 = 0.001191 RRC
155/80R13 (I think there is a typo in the OP) = 0.01223 RRC(103%)
So that would appear to be the wrong direction.
What about a 165/80R13? 0.001202 RRC (101%)
A couple of thoughts: These are pretty small differences considering the accuracy of the regression equation (Opps! I noticed I didn't say on the web page how good the regression equation was! r squared = 66% - which honestly isn't very good - but it is what it is.)