Uberoo Posted March 21, 2009 Share Posted March 21, 2009 With stock 175/70/13 tires at 2200 RPM in 4th gear (.769) with stock 3.9 rear end ratio I go 45 MPH.What tire size Would yield 55 MPH at the same RPM,same mechanical gear ratio. Quote Link to comment Share on other sites More sharing options...
ivantruckman Posted March 21, 2009 Share Posted March 21, 2009 someone on the Bord had a tire size calculator post a while ago. i cant seem to find it Quote Link to comment Share on other sites More sharing options...
johnceggleston Posted March 21, 2009 Share Posted March 21, 2009 With stock 175/70/13 tires at 2200 RPM in 4th gear (.769) with stock 3.9 rear end ratio I go 45 MPH.What tire size Would yield 55 MPH at the same RPM,same mechanical gear ratio. you would need a tire 22% larger. these sizes will get you very close, if they exist: 205/85/14 215/75/15 195/75/16 (or 185/80/16) with stock outback, 205/70/15, you'd be going about 52 mph. but will an ea81 have the power to push those tires? Quote Link to comment Share on other sites More sharing options...
Uberoo Posted March 22, 2009 Author Share Posted March 22, 2009 you would need a tire 22% larger.these sizes will get you very close, if they exist: 205/85/14 215/75/15 195/75/16 (or 185/80/16) with stock outback, 205/70/15, you'd be going about 52 mph. but will an ea81 have the power to push those tires? I never said anything about an EA81:grin: Quote Link to comment Share on other sites More sharing options...
baccaruda Posted March 22, 2009 Share Posted March 22, 2009 http://www.miata.net/garage/tirecalc Quote Link to comment Share on other sites More sharing options...
johnceggleston Posted March 22, 2009 Share Posted March 22, 2009 I never said anything about an EA81:grin: will the mystery engine please sign in? ej22 swap? Quote Link to comment Share on other sites More sharing options...
Uberoo Posted March 22, 2009 Author Share Posted March 22, 2009 will the mystery engine please sign in? ej22 swap? I have a thread about stronger springs just below this thread... Quote Link to comment Share on other sites More sharing options...
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