I am just going by tire diameter, not odometer set-up. I calculate tire outside diameter to be approximately the following: 185R14 25.9" 0% 195/70R14 24.7" -5% 195/75R14 25.5" -2% 205/70R14 25.3" -2% 27X8.50 14 27.0" +4% 225R14 28.5" +10% Now, all mechanical speedometers are typically conservative by approx. 2%. So, with 27X8.50 14 tires, I would expect the speedometer is reading 2% slower than with 185R14. At an indicated 65 MPH, that's 1 MPH or an actual speed of 66 MPH. --- On Wed, 5 Mar 1997 12:10:25 -0500 (EST) SyncroHead@aol.com wrote: >In a message dated 97-03-04 22:22:49 EST, mdstockr@neo.lrun.com (mdstockr) >writes: > >> >> TIRE SIZES >> ---------- ><snip> >> 27X8.50 14 1* >> 225R14 1* >> >> * These tires have diameters smaller/larger than original >> You will see speedometer/odometer errors > >My experience with the 27x8.50R14 BFGoodrich Radial All Terrains is that they >actually eliminated my odometer error. Previously my smaller tires over >estimated distances. Now whenever I measure my odometer against the highway >odometer check signs I'm off my .05 miles or less over 5 miles of >measurement. That's about 1% or less from actual. > >Jim Davis >87 GL Syncro >88 GL Wolfsburg > -----------------End of Original Message----------------- ________________________________________________ Michael Stocker <mdstockr@neo.lrun.com> North Canton, Ohio, USA Time: 1:42:52 PM LiMBO / GASS Date: 3/5/97 1989 Audi 90 Quattro Wanted: Nice 1968-> air cooled or diesel Previous VW's: '66-T3, '67-T1 & '70-T2 Westi ________________________________________________
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