Tyre size comparison

Julian

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Sep 9, 2012
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Saw this posted on the SA forum, not sure you all will have seen it, its from an Australian 4x4 magazine
Basically it is a comparison of 31"-33"-35" on a single vehicle to see the difference in approach, ramp and departure angle plus power loss

Tyre......Approach...Departure...Ramp-over....Diff
Size......Angle.........Angle..........Angle.............Clearance
____________________________________________
31"........41deg.......40deg.........16.7deg........220mm
33"........43deg.......42deg.........17.5deg........245mm
35"........46deg.......43deg.........18.4deg........270mm

Power drop at the wheels on Dyno due to increase in inertia of the bigger tyres
31's vs 35's = 13%

Conclusion; Running bigger tyres has more upsides than downsides
 

sae70

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Aug 10, 2010
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That's interesting info :think: Thank you :thumbup:

I hope you don't mind but I thought that I would post this up onto your thread :)

This clearly relates to Fiery my Collie & all other Collies come to that, but may be of use to others :)

265/70/16 30.61/10.43/16
Standard Fitment

265/75/16 31.65/10.43/16
Increase in diameter over standard 26.42mm increased clearence over std fitment +13.21mm increased clearence over previouse size 13.21mm

305/70/16 32.81/12.00/16
Increase in diameter over standard 55.88mm increased clearence over std fitment +27.94mm increased clearence over previouse size 14.73mm

285/75/16 32.83/11.22/16
Increase in diameter over standard 56.39mm increased clearence over std fitment +28.19mm increased clearence over previouse size 00.25mm

255/85/16 33.07/10.04/16
Increase in diameter over standard 62.48mm increased clearence over std fitment +31.24mm increased clearence over previouse size 03.05mm

This of course makes no allowance for how these tyre sizes are effected by rim width & inflation pressure
 
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