Bell-Auto-Services Posted August 16, 2009 Share Posted August 16, 2009 what is the rolling radius of the simex 32/10.50/16ET tyre is the 32" the hight? Ive never been over clever with tyre sizes and rolling radius's. Pete Quote Link to comment Share on other sites More sharing options...
Godlykepower Posted August 16, 2009 Share Posted August 16, 2009 There is a calculator on the Beds, Herts, Cambs Land Rover Club website. I dont know if this is exactly what you need though? There is also an MPG calculator on the same page. CLICKY Quote Link to comment Share on other sites More sharing options...
Bell-Auto-Services Posted August 16, 2009 Author Share Posted August 16, 2009 There is a calculator on the Beds, Herts, Cambs Land Rover Club website. I dont know if this is exactly what you need though? There is also an MPG calculator on the same page. CLICKY Thanks , ill take a look Im trying to compare the rolling radius of a 225/55/19 To the simex 32/10.50/16 so i can make final drive calculations for my TDV6 defender conversion. Pete Quote Link to comment Share on other sites More sharing options...
Lars L Posted August 16, 2009 Share Posted August 16, 2009 Please note that the tyre sizes are nominal and may differ from one manufacturer/type of tyre to another. Check the manufacturers technical data to get correct information. Quote Link to comment Share on other sites More sharing options...
Bush65 Posted August 16, 2009 Share Posted August 16, 2009 Thanks , ill take a look Im trying to compare the rolling radius of a 225/55/19 To the simex 32/10.50/16 so i can make final drive calculations for my TDV6 defender conversion. Pete 32/10.5/16 is size in inches - 32" diameter, 10.5" wide, 16" diameter rim. 225/55/19 is metric size - 225 mm wide, 55 is aspect ratio of width the section height as a percentage (225 mm wide x 55/100 = 124 mm high), 16" (16 x 25.4 = 406 mm) diameter rim. Then tyre diameter is 406 mm + (2 x 124 mm) = 654 mm (25.7"). As Lars L said, all sizes are nominal only. Quote Link to comment Share on other sites More sharing options...
Bell-Auto-Services Posted August 16, 2009 Author Share Posted August 16, 2009 32/10.5/16 is size in inches - 32" diameter, 10.5" wide, 16" diameter rim. 225/55/19 is metric size - 225 mm wide, 55 is aspect ratio of width the section height as a percentage (225 mm wide x 55/100 = 124 mm high), 19" (19 x 25.4 = 482.6 mm) diameter rim. Then tyre diameter is 482.6 mm + (2 x 124 mm) = 730 mm (28.74"). As Lars L said, all sizes are nominal only. Thank you very much for your detailed explnation. Pete Quote Link to comment Share on other sites More sharing options...
custom-conversions Posted August 16, 2009 Share Posted August 16, 2009 32/10.5/16 is size in inches - 32" diameter, 10.5" wide, 16" diameter rim. 225/55/19 is metric size - 225 mm wide, 55 is aspect ratio of width the section height as a percentage (225 mm wide x 55/100 = 124 mm high), 16" (16 x 25.4 = 406 mm) diameter rim. Then tyre diameter is 406 mm + (2 x 124 mm) = 654 mm (25.7"). As Lars L said, all sizes are nominal only. Need to add 3" as its a 19" Rim. 28.7" Diameter Your 32's would be about an 11% increase Quote Link to comment Share on other sites More sharing options...
BogMonster Posted August 16, 2009 Share Posted August 16, 2009 There's a few available if you google tyre size calculator http://www.google.co.uk/#hl=en&q=tyre+size+calculator&btnG=Google+Search&meta=&aq=f&fp=ea45c7634589e784 Top two returns are both good ones Quote Link to comment Share on other sites More sharing options...
mmgemini Posted August 17, 2009 Share Posted August 17, 2009 There aren't any Greek letters on here. Pye X D Where Pye + 3.142....... mike Quote Link to comment Share on other sites More sharing options...
sean f Posted August 17, 2009 Share Posted August 17, 2009 The calculation for circumfrence is pye x d or pye x 2r. Where pye is 3.14 (plus lots more decimals if you need to be very accurate) and r is the radius. If you want a reasonable accurate value (calibrating an aftermarket speedo?) the best way is to park on level ground check you tyre pressures are correct then meaure from the centre of the hub to the ground for a value for r. It will vary for the same tyre depending on tyre pressure / wear / rotation speed etc so high precision is not normally needed. Quote Link to comment Share on other sites More sharing options...
fekete Posted August 17, 2009 Share Posted August 17, 2009 Hi pete try this http://www.miata.net/garage/tirecalc.html Regards Karl Quote Link to comment Share on other sites More sharing options...
Bush65 Posted August 17, 2009 Share Posted August 17, 2009 Need to add 3" as its a 19" Rim. 28.7" Diameter ... Thanks for the correction. I must have had a seniors moment when writing that post (not used to the wheel sizes on some new vehicles). I hope it is obvious to others that I should have used 19" instead of 16" for the wheel diameter. Quote Link to comment Share on other sites More sharing options...
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