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| twr7cx |
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I was playing around with a speedo calculator this afternoon, and afterwards I was thinking that it didn't ask me the width of the wheel that the tyre is on. Surely this effects the calculations somewhat?
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| Froudey |
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Width i wouldn't think so as it is the height that really makes or brakes it cause as the width of the tyre is more related to the traction i'd say
feel free for fellow members to correct
_________________ R.I.P Tobias my son. |
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| Steady ED |
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twr7cx wrote: I was playing around with a speedo calculator this afternoon, and afterwards I was thinking that it didn't ask me the width of the wheel that the tyre is on. Surely this effects the calculations somewhat? yeah if you stretching the tyre a massive amount on the rim then it will definately have a smaller rolling diameter. But that would be an extreme, and still probably not a massive amount of difference. I mean if you stretch a tyre onto a rim enough that it is going to affect rolling diameter THAT much, it's probably not gonna seal anyway!!
_________________ ED XR8 Sprint - S-Trim, V500, 249rwkw |
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| krisisdog |
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Tyre size is 235, width/ 35, height in a percentage of width /18 rim size.
So yes, to be accurate you should have to put in all the details. |
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| twr7cx |
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Steady ED wrote: twr7cx wrote: I was playing around with a speedo calculator this afternoon, and afterwards I was thinking that it didn't ask me the width of the wheel that the tyre is on. Surely this effects the calculations somewhat? yeah if you stretching the tyre a massive amount on the rim then it will definately have a smaller rolling diameter. But that would be an extreme, and still probably not a massive amount of difference. I mean if you stretch a tyre onto a rim enough that it is going to affect rolling diameter THAT much, it's probably not gonna seal anyway!! What about the opposite of putting a tyre that is wider than required for the rim? |
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| hans hartman |
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twr7cx wrote: I was playing around with a speedo calculator this afternoon, and afterwards I was thinking that it didn't ask me the width of the wheel that the tyre is on. Surely this effects the calculations somewhat? no,the circumference of the tyre,air pressure,wear on tread==linear roll length per revolution of the wheel,to determine the gear ratio to speedo.to do a check use a gps for speed.thats why the rims are 15,16,17 and will fall into the speedo limits,i havnt tried over 17s,but the cop speedo may compensate enough over 17s as the rims get bigger and the tyre wall profile reduces to keep the dia. the same,unless the tyre is larger in dia, over stock one or it distorts larger with speed like a dragster tyre.then a gps will pick it up at higher speeds.
_________________ R.I.P HANS HARTMAN |
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| Steady ED |
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twr7cx wrote: Steady ED wrote: twr7cx wrote: I was playing around with a speedo calculator this afternoon, and afterwards I was thinking that it didn't ask me the width of the wheel that the tyre is on. Surely this effects the calculations somewhat? yeah if you stretching the tyre a massive amount on the rim then it will definately have a smaller rolling diameter. But that would be an extreme, and still probably not a massive amount of difference. I mean if you stretch a tyre onto a rim enough that it is going to affect rolling diameter THAT much, it's probably not gonna seal anyway!! What about the opposite of putting a tyre that is wider than required for the rim? Still the same, the sidewalls are going to 'lay over' and slightly reduce rolling diameter, but again, you are talking a massive mismatch in rim vs tyre width to make a significant difference. P.S. I am the only person who understood your post 
_________________ ED XR8 Sprint - S-Trim, V500, 249rwkw |
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| twr7cx |
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Steady ED wrote: P.S. I am the only person who understood your post I noticed.   
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| FordFairmont |
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Posts: 6113 Joined: 8th May 2007 |
i think your worrying about nothing.... what are we talking about, maybe 0.5 or 1.0km difference at the most?
you should be worrying about the different shapes & sizes of tyres from different brands, even though they have the same size markings on them |
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| krisisdog |
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twr7cx wrote: Steady ED wrote: P.S. I am the only person who understood your post I noticed. HA I get it now. RIM width doesnt matter, for a calculator at least. |
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