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Tyre size comparison

Julian

Well-Known Member
Joined
Sep 9, 2012
Messages
694
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
 
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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