RE: [Chevelle-list] 2 questions

[Dale]

Title: Message

Kumho doesn’t list the EXACT 335/35/17 tire Clint has but rather a new, lighter tire of the same size.  Their website actually lists two models of 335/35/17 tires and they measure one at 26” diameter and the newer model at 26.2”.  What the speedometer indicates is immaterial since the actual speed is calculated by engine RPM, tire size, and rear gear ratio – assuming your tires are correctly inflated, don’t ‘grow’ at 100+ mph and your tachometer is dead-on to the exact RPM (not a likely event either), and there’s no slippage in the drive train.   And it depends on which formula you use I suppose.  Two I’ve found are:   1. (rpm x tire dia) / (gear ratio * 336) and at 6000 RPM * 26.0” tire (156,000) divided by 4.11 x 336 (138.96) yields 112.9649.   2. (tire dia x rpm x rear gear) / .002975 and that one yields 112.9197.   Substituting a 26.2” tire for a 26” tire gives 113.8339 and 113.7883 respectively.  Depending on how the online calculator rounds the result…Suffice to say it’s faster than you’re allowed to go on most U.S. highways. <G>   Dale McIntosh 67 El Camino 1967 Chevelle Reference CD now available! ACES #1709/TC Gold #92 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Clint Hooper Sent: Thursday, November 03, 2005 2:01 PM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] 2 questions   Uhhh,,,no. <g> I don't think so. 24" tires would jack those numbers up,considerably. I know my El Camino's speedo is off a little bit. But,those numbers I gave were from my ZR-1's that had the trans & rear ratios and tire diameter. Their speedo readings were very close. Welcome back,Andre. Glad to have you with us again. Sometimes a brief sabbatical is good. Clint Hooper H&H Custom,owner 1969 El Camino ProTourer 2001 H-D FLHR custom bagger http://dalesplace.com/misc/friends/clint/clint_hooper.htm ----- Original Message ----- From: André-Tigergutt   to see 70mph at 4k rpm you rear tires should be around 24"   this is not get back on the list and start right away being a pain in the axx, its just to let you know that maybe your speedo might be a tad off. Have Fun André