Don't know about your math but those rev/mile numbers are way off from reality. Check any tire company spec chart or measure yourself, I have done both. 185R14 often around 805 rpm 215/75/15 often around 755 rpm Mark
Tim wrote: >Now, the final piece is revs / mile = > >63360 (inches per mile) / (diameter *3.1415) > >215/75x15 = 728.1950449 revs per mile > >185r14 = 786.1958473 revs per mile > >I hope my math is correct. > >-----Original Message----- >From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of >Kim Brennan >Sent: Monday, April 18, 2005 2:05 PM >To: vanagon@GERRY.VANAGON.COM >Subject: [Norton AntiSpam] Re: whats the biggest 16" tire you can run on a >2wd vanagon?? > >There are differences in actual diameter between different brands of >tires and tread wear, however, the basic math is... > > tirewidth x ratio of sidewall x 2 / 25.4 (to convert millimeters to >inches) + diameter of wheel = diameter of tire. > >[ 215 (mm) x .55 (ratio) x 2 (we're doing a diameter so it's in two >places) ] / 25.4 (mm's to the inch) + 16 (wheel diameter) = 25.31 >inches >[ 205 (mm) x .70 (ratio) x 2 / 25.4 ] + 14 = 25.29 > >That's close enough not to worry (70% was the ratio on the tires not >75)...but let's do the match with 75% ratio tires... > >[ 205 x.75 x 2 / 25.4 ] + 14 = 26.1 > >Standard tires (without a ratio value have the sidewall being 80% of >the tread width....) > >[ 185 (mm) x .80 x 2 / 25.4 ] + 14 = 25.65 > >Syncro enthusiasts recommendation > >[ 215 x .75 x 2 / 25.4 ] + 15 = 27.70 > > >On Apr 18, 2005, at 1:27 PM, JordanVw@AOL.COM wrote: > > > >>i talked to benT and he reccomended a 215-55-16 tire.. but someone >>else told >>me that this is "same as stock" rolling diameter of a 205 75 14??? >> >> > > > |
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