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The Pub For General Automotive Related Talk |
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#1 | ||
Regular Member
Join Date: Mar 2015
Location: Gold Coast, Queensland
Posts: 89
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Hey guys, very very random question, i thought i would ask here.
i have a mini bike racing tire, im trying to find the circumference so i can set up my speedo. it is a - 110/50-6.5 Racing Slick ![]() circumference needs to be in MM. Hope someone can help. Cheers ![]()
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"If Everything Seems Under Control, You're Not Going Fast Enough" - Mario Andretti 2009 Fg Xr6 Sedan n/a 5 Speed Auto - 14.1 @99 MPH Mods: Redback Exhaust & Cold Air Intake Untuned |
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#2 | ||
FF.Com.Au Hardcore
Join Date: Oct 2010
Location: Mid North Coast
Posts: 6,442
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Tape-measure would be your friend here.
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#3 | ||
Regular Member
Join Date: Mar 2015
Location: Gold Coast, Queensland
Posts: 89
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Thanks! do you know how to messaure it using a tape? cheers
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"If Everything Seems Under Control, You're Not Going Fast Enough" - Mario Andretti 2009 Fg Xr6 Sedan n/a 5 Speed Auto - 14.1 @99 MPH Mods: Redback Exhaust & Cold Air Intake Untuned |
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#4 | ||
FF.Com.Au Hardcore
Join Date: Apr 2012
Location: Taromeo
Posts: 10,446
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Wrap a cloth tape measure around the middle of the tyre, make sure it's fairly firm.
If you don't have a cloth one, use a piece of string and mark it clearly, then measure it. |
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#5 | ||
Clevo Mafia Inc.
![]() Join Date: Dec 2004
Location: Melbourne
Posts: 10,496
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If you have trouble getting a tape around it try marking the edge of the tyre with chalk. Move said mark to the bottom and mark the ground where it touches.
Then move the tyre a single full revolution and mark the ground again. Then measure the distance between the two marks you have on the ground. This is how I used to setup my Husaberg speedo when using the Trail Tech Vapor. Would be best fitted to a rim and inflated before measuring. |
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#6 | ||
FF.Com.Au Hardcore
Join Date: Nov 2006
Posts: 1,127
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It is 110 mm wide and 50% profile which is 110 (55 mm top and bottom ) plus 6.5 inch wheel which is 165.1mm . Diameter is 110 plus 165.1 which is 275.1. Circumference is 2rp which is 863.8mm.
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#7 | |||
Regular Member
Join Date: Mar 2015
Location: Gold Coast, Queensland
Posts: 89
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Quote:
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"If Everything Seems Under Control, You're Not Going Fast Enough" - Mario Andretti 2009 Fg Xr6 Sedan n/a 5 Speed Auto - 14.1 @99 MPH Mods: Redback Exhaust & Cold Air Intake Untuned |
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#8 | ||
PURSUIT 250
![]() Join Date: Mar 2009
Location: sydney
Posts: 5,775
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the 50% side wall includes the part that goes inside the wheel right? so that maths may be out
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#9 | ||
PURSUIT 250
![]() Join Date: Mar 2009
Location: sydney
Posts: 5,775
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just checked you are correct
http://tire-size-conversion.com/tyre-size-calculator/ |
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#10 | ||
Regular Member
Join Date: Mar 2006
Posts: 172
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Measure outside diameter then multiply by PI (3.142)
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#11 | ||
Moderator
![]() ![]() Join Date: Feb 2005
Location: Kenthurst
Posts: 40,394
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Although tyres do have set dimensions ... not all are equal ... but come close to be classed for that size.
For ultimate accuracy though ... it is best to have the tyre in front of you on the rim at the inflated pressure and measure that way preferrably.
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#12 | ||
FF.Com.Au Hardcore
Join Date: Jun 2010
Location: Desert City
Posts: 2,326
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As esppwr said PIxD (3.1416 x ?)
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#13 | |||
FF.Com.Au Hardcore
Join Date: Nov 2006
Posts: 1,127
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Quote:
Radius of a tyre changes depending on pressure and speed when mounted on a vehicle . Manufacturers will publish both static and rolling diameter of a tyre at 60 km/h ( bit hard for us to measure a rolling tyre ). Here is the example of a tyre calculator that uses dynamic and static diameter , contact patch size , air volume , tyre comfort suspension value etc. http://bndtechsource.ucoz.com/index/...alculator/0-20 Last edited by SumoDog68; 22-08-2015 at 08:27 AM. |
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#14 | ||
FF.Com.Au Hardcore
Join Date: Feb 2008
Location: Perth, Northern Suburbs
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But Pies AREN'T squared? They're round.
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#15 | ||
FF.Com.Au Hardcore
Join Date: Feb 2008
Posts: 2,312
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wow, 10 responses before someone used their high school maths.
![]() Good on ya esppwr.
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#16 | ||
FF.Com.Au Hardcore
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