WC Speeds

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Dose anyone know what the speed difference would be on a WC 1st gear if I went from 13.6/28 to 13.6/36 tires? 1850 rpm,s. Thanks Gary

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Gary(MO) Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 03 Jun 2011 Location: Missouri Points: 447	Post Options Post Reply Quote Gary(MO) Report Post Thanks(0) Quote Reply Topic: WC Speeds Posted: 17 Apr 2013 at 4:19pm
	Dose anyone know what the speed difference would be on a WC 1st gear if I went from 13.6/28 to 13.6/36 tires? 1850 rpm,s. Thanks Gary

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wi50 Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 24 Sep 2010 Location: weegieland Points: 1010	Post Options Post Reply Quote wi50 Report Post Thanks(0) Quote Reply Posted: 17 Apr 2013 at 4:55pm
	I don't know off the top of my head, but I posted the gear ratios a while back if you search, "allis gear ratios" here or on YTmag you'd find them. Then if you have the rolling radius of your tires you could figure out the difference. Just say that 1st gear is for example 64 to 1 meaning that 64 turns of the crankshaft is equill to 1 turn of the wheels. If the rolling radius of the tire is 24" then the circumfrance is 151 inches, at 1850 RPM the tire is turning 28.9 RPM. 28.9rpm X 151 circumfrence =4364 inches per minute or 363.6 feet per minute 363.6 fpm X 60 = 21819.5 feet per hour or 4.13 MPH Find the rolling radius of the tires in question and then a guy can figure it out from there. I just don't rember the WC gear ratios without looking them up again.
	"see what happens when you have no practical experience doing something...... you end up playing with calculators and looking stupid on the internet"

DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 20536	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 17 Apr 2013 at 6:15pm
	My charts say 2.5 MPH @1300 RPM with 13.6 x 28 rear tires. My math says 3.1 MPH @1300 RPM with 13.6 x 36 rear tires. More math says 4.4 MPH @ 1850 RPM. Now, pulleeze remember, that there is a difference in tire brands and wear on the tire lugs when it comes to total diameter, which will affect MPH. Also, if you are running on a sled that has a speed limit horn, you are under the horns control and what you think you're running doesn't mean squat.