Air pressures when running car tires on an RT

[kenk]

kenk

I just put a Kumho on mine it met all specs if the BRP tire but was about a third the cost ,run 30lbs. and no trouble.

 

[ThreeWheels]

I keep 28PSI in my stock front tires and no problem

WOW.
That seems like a lot of pressure to me.
Just my opinion, and I know you didn't ask, but I found pressures that high made the Spyder twitchy.
Pressure that high round out the tire profile and minimizes the contact patch which makes the bike less stable at speed.
Running lower pressure increases the contact patch and makes the spyder feel more "planted".
Just my own humble opinion, and of course whatever works for you is terrific.

 

[MarkLawson]

You should not have different tires (models) frt or rear or different makes frt or rear on your machine, they should be the same brand and model. Size. should be what BRP puts on your machine when new.

I think others may have misunderstood your message, or it could be that I've misunderstood it. I believe you're saying that whatever band and model tires you decide to use, they should be the same brand and model on the front and rear of your Spyder.

This has always been the rule for two wheeled motorcycles because the tread designs often are intended to work together (front & rear) to give the best results. As the Spyder does not have a rear wheel generally following in the track of the front wheel, I doubt this same rule applies for the Spyder.

As for size, I also disagree to a point. The sensors and computers on the Spyder measure wheel rotation in relation to each other, amongst other things, so going to different tire sizes may cause unintended consequences. I have found that there is some wiggle room that not only has no noticeable impact to the Nanny in the form of error codes, but did make my speedometer & odometer far more accurate, according to my GPS. With the tires I mounted as described below, my speedometer is never more than 1 mph different than my GPS & often shows the same speed. The Spyder's odometer is normally showing 100 miles with the GPS's odometer showing between 102 & 103 miles.

I am currently running Michelin Defenders 175/65R14's on the front and a Michelin HydroEdge 215/60R15 on the rear. As the rear was replaced 11,518 miles back and the fronts only 3,773 miles back, and the HydroEdge was no longer available, I found myself buying the Defender instead. At 11,518, the rear tread depth measures 8/32" across the tread, which is down from the original 11/32". This measurement suggests I may get another 23,000 miles before it reaches its legal wear out. All three tires boast a 90,000 mile tread life, but I'll not expect that on the rear. The fronts are at about 9.5/32", down from the original 10/32". At this rate, I might get 50,000 - 60,000 before legal wear out. My tire wear is pretty even so far, and I am running within the BRP recommended tire pressure range.

By the way, all of these tires are cheaper to buy than the OEMs, & have much better tread life and great traction.