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Rear Tire Pressure - General Altimax RT43

jbs1218

Member
Those of you who are using the Altimax RT43 tire on the rear of the Spyder, what tire pressure are you running at? Thank you.

Jim
 
Those of you who are using the Altimax RT43 tire on the rear of the Spyder, what tire pressure are you running at? Thank you.

Jim


Jim
I am running the General Altimax RT43 tire on the rear of my spyder.

I am running 26PSI.

I ride solo.

Deanna
 
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By the numbers...

Take the tires max load and divide that by the max inflation pressure (all on the tires side wall). That will tell you how many pounds of load each psi of tire pressure will carry. Divide the weight actually on the rear tire (fully loaded with you gear and fuel) by that result and you'll have a good starting pressure. Set the tire (cold) to that pressure and go for a 'normal' (for you) ride. Check the pressure when you finish the ride. If the pressure doesn't increase the starting pressure is probably too high. If it increases more than 4 psi the starting pressure is probably too low.

I run my rear tire at 16 psi (not an Altimax) and after a good ride it goes up 2.2 psi., so I'm in the ballpark. It's handy to have a scale nearby.
 
:agree: with that! ButterS has laid it out very succinctly for you! :thumbup:

Anything over 20 psi is very likely too high, unless maybe you & your load weigh in over something like 600 lbs!! :shocked: . But instead of repeating what's been put out there many many times already, I'd suggest that you simply type 'tire pressure' into the search field up the top right, tick the drop down box that says 'Search Titles Only' & hit the magnifying lens button, then settle in for some quality reading time! ;) . Here's one I prepared earlier, that may or may not work for you...

https://www.spyderlovers.com/forums/search.php?searchid=3294433

Sure, the results you'll get back from that search may not ALL be about the Altimax RT43 Specifically, but it's mostly about car tires of the same size, same construction, and same sort of load range, so the pressures required are very similar, generally within +/- 2 psi, unless you & your load weighs A LOT, or a tiny amount, but give or take 300+ lbs or so, the recommended pressures of about 16-18 psi for an auto tire under the rear of a Spyder is within the 'of no further benifit & largely just time wasting for most to try to adjust more exactly' range. :rolleyes:

Over to you jbs. :cheers:
 
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I rode my '13 RTL with GA RT43 at 18lbs Solo, 20lbs if on extended 2 up rides. Tire lasted about 30,000 miles and I might've spun it or drifted it a couple times.
 
I'm a big ol' fat guy (over 250) + gear. I settled on 18 after trying lower and higher pressures. The Altimax preformed perfectly at that pressure..... Jim
 
:agree: with that! ButterS has laid it out very succinctly for you! :thumbup:

Anything over 20 psi is very likely too high, unless maybe you & your load weigh in over something like 600 lbs!! :shocked: . But instead of repeating what's been put out there many many times already, I'd suggest that you simply type 'tire pressure' into the search field up the top right, tick the drop down box that says 'Search Titles Only' & hit the magnifying lens button, then settle in for some quality reading time! ;) . Here's one I prepared earlier, that may or may not work for you...

https://www.spyderlovers.com/forums/search.php?searchid=3294433
Peter, thank you for info. I did the search as you suggested and found some good information.
 
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Take the tires max load and divide that by the max inflation pressure (all on the tires side wall). That will tell you how many pounds of load each psi of tire pressure will carry. Divide the weight actually on the rear tire (fully loaded with you gear and fuel) by that result and you'll have a good starting pressure. Set the tire (cold) to that pressure and go for a 'normal' (for you) ride. Check the pressure when you finish the ride. If the pressure doesn't increase the starting pressure is probably too high. If it increases more than 4 psi the starting pressure is probably too low.

I run my rear tire at 16 psi (not an Altimax) and after a good ride it goes up 2.2 psi., so I'm in the ballpark. It's handy to have a scale nearby.

ButterSmooth, thank you. I need to get my calculator out.
 
I'm running 17/18 cold and the center is wearing faster than the outside edges. Lots of rubber on edges, down to the wear bars in the middle.
 
2Dogs, how many miles do you have on your rear tire?

30k+ and the center is getting a little thin. I've got a new one sitting in the garage so this time I'm going to drop the PSI to 16 and see how that works. I run 16 in the front and there's hardly any signs of wear. Hot the rear gets to 20 and the fronts get to 18. I'm getting pretty good performance and wear but I think I can improve it just a little more.
 
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