Rear tire

    Hey, my MT is coming off my sling... just not a good fit for the colder weather up here. Got a Nitto G2 to replace it... came in today.

    :00000436:
    Success is a lousy teacher. It seduces smart people into thinking they can't lose. - Bill Gates

    Quote from Casey_SS

    On an SL, what guidelines do you follow to keep the nanny codes from showing up?

    Generally speaking, you want to keep the ratio between the front and rear tire diameters as close as possible to the stock ratio (SL Front - 25.98" or 659.7mm, Rear 27.02" or 686.5mm). This means keeping the rear tire diameter about 4% larger than the front tires. As you vary from this value, you're more likely to start seeing nanny lights activated.
    I don't know if Polaris uses a different ECu value for the SLR. The SLR is only slightly different compared to the SL in that the rear tire is about 4.6% larger than the front tires.


    For the Base Slingshot, the numbers are Front - 25.08" or 636.8mm, Rear - 25.3" or 642.7mm, meaning the rear tire should be roughly .9% larger than the front tires. With my stock factory front tires, I've run the following rear tire sizes - 265/35R18, 275/35R18 (.4" taller than stock), 295/30R18 (.34" shorter than stock) and a 315/35R17 (.38" taller). I also bought a set of Base wheels that came with a Federal 285/30R18 rear tire which is .56" shorter than stock, but I haven't tried it

    Quote from cbailey7a

    @Slingrazor yes it is the oem sl wheel 20x9

    As an example, Nitto lists these sizes for their 555 G2 as fitting on a 9" wide wheel -

    255/35ZR20 97W XL 211010 11.0 27.01 10.24 8.5-(9.0)-10.0 1609 @ 50 29.16
    255/45ZR20 105W XL 211140 10.2 29.06 10.04 8.0-(8.5)-9.5 2039 @ 50 31.97
    265/35ZR20 99W XL 211110 11.0 27.32 10.67 9.0-(9.5)-10.5 1709 @ 50 31.17
    275/30ZR20 97W XL 211310 11.0 26.54 10.94 9.0-(9.5)-10.0 1609 @ 50 30.74
    275/35ZR20 102W XL 211020 11.0 27.56 10.94 9.0-(9.5)-11.0 1874 @ 50 32.01
    275/40ZR20 106W XL 211100 11.0 28.66 10.94 9.0-(9.5)-11.0 2094 @ 50 33.36


    Your best choices might be the 265/35R20, 275/35R20, 275/40R20, or the 255/45R20. As you move right on the list, the chances of triggering a nanny control increases. This link will give you an idea of tire diameters/speedometer changes - Tire Size Calculator | Check Tire Size Conversion | Discount Tire.

    Looks like you keep within an inch difference in diameter between front and back.


    Thats what I was working working with as I've been searching for rims.\


    Looking at:
    Front 20 x 9
    Rear 20 x 11 or 12


    Not sure yet, the 12" pretty much puts me in Toyo Proxes T1R but there is a nationwide backorder on them. Lexani has the same tire 345/25/20, looking for review / info on Lexani tires



    Looks like the following combinations will work:
    Proxies T1R
    20x9 front with 255/30/20 diameter 26.1 tread width 8.8
    20x12 rear with 345/25/20 diameter 26.8 tread witch 12.6 (0.7 difference)


    Nitto Motivo
    20x9 front with 255/35/20 diameter 27.09 tread width 10.04 (1.45 inch spread, might be to much ?????)
    or
    20x9 front with 245/40/20 diameter 28.03 tread width 10.16 (0.51 difference)


    20x12 rear with 315/35/20 diameter 28.54 tread width 12.52


    Thoughts??


    Thanks

    John
    2017 SL LE Midnight Cherry
    :COILOVERSS::TURBOSS::MOTOROILSS::FILTERSS::COLDAIRSS::DONKEYSS:

    @Casey_SS, the Proxies T1R sizes you posted should work fine together. As for the Nitto, the 245/40R20 with the 315/35R20 should work fine and I think even the 255/35R20 might work OK with the 315/35R20 w/o triggering the nannies, but I'd like to know if anyone else is already running those sizes before I bought them. :D

    I think some people are running a 305 on the stock SL rim
    Anybody know which tire and size it is?


    Actually I found it
    305/35/20 Nitto G2


    stock ratio (SL Front - 25.98" or 659.7mm, Rear 27.02" or 686.5mm).



    Stock SL front has a diameter of 25.98"
    The recommended tire for running on the stock SL rear is the Nitto 555G2 305/35/20, the diameter is 28.43


    That'a a difference of 2.45 inches, is anybody getting codes thrown from this combination???


    I see the 305/30/20 has a diameter of 27.24 which is a difference from the stock fronts of 1.56 inches. Is this the one that should be run and not the one originally listed above?




    305/30ZR20 103W XL 211220 11.0 27.24 12.32 10.5-(11.0)-11.5 1929 @ 50 34.24
    305/35ZR20 107W XL 211420 10.2 28.43 12.32 10.0-(11.0)-12.0 2149 @ 50 35.27

    John
    2017 SL LE Midnight Cherry
    :COILOVERSS::TURBOSS::MOTOROILSS::FILTERSS::COLDAIRSS::DONKEYSS:

    Edited once, last by Casey_SS: found it ().

    My rear tire is 28.45 and my fronts are 25.43.
    NO CODES on 2 different slings and have been running this way for over 18 months.
    Tires are Nitto 555G2.

    Lexani Tires; I used two of the LX-30's on my previous '16 SLR. They were "40's" and I had no nanny issues. Best as I remember they were 275-40-18. Wear was about 8k or so. The taller tire definitely improved ride..it was that noticeable. Can't comment on handling as I'm an easy driver and rarely got caught in much rain. I think they are a very good tire for the money, and will probably use one again when the 305 on current Slr wears out. My only complaint about them, and OEM's, are they pick up small gravel like crazy from my driveway.

    18 SLR Lemon/Gray
    Vanderhall Venice (traded for SLR Apr '18)
    '16.6 SLR LE (traded for Vanderhall Oct '17)
    '11 & '14 Can Am RT's
    60 Years of 2 Wheeling

    My earlier statement where I said the "255/35R20 might work OK with the 315/35R20 w/o triggering the nannies" was partially based on @Slingrazor's experience running the much taller than normal tire.
    I'd love to have a Polaris engineer or an engineer from one of the tire companies provide more details on tire sizing and the interaction with Traction and Stability Control systems since those 2 systems would seem to be more affected by changes in tire sizes than would ABS. Such info would go along way towards clearing up the many questions about safely changing tire sizes.
    Most tire manufacturers provide recommend wheel sizes for their tires. Here are links for Nitto 555 G2s and Motivos -
    NT555 G2 Summer Ultra High Performance Tire | Nitto Tire.
    Motivo All-Season Ultra High Performance Tire | Nitto Tire.
    Technically, Nitto recommends using 10" wheel minimum for the 305 tire, although I seem to remember seeing some Mustang and other vehicle owners posting they'd used a 9.5" wheel. Using a smaller than recommended wheel might well void any warranties, especially in the case of an accident that could be linked to using a smaller than recommended wheel.

    Will keep this thread handy-a lot of good info. Forgive me if I missed it but what about side wall stiffness? I like my Federal on the rear but sometimes I swear I can feel a little side movement- but it handles well none the less.

    We’ll get there when we get there and not a minute before. 😎

    Polaris' choice of wheel offsets does complicate finding mass-market (affordable) wheels. When I first started looking for an affordable way of adding new wheels, I would often find a wheel I liked that fit the Front of the Rear, but then would all-too-often discover there wasn't a usable matching size for the other end, usually because of offset.
    The cheapest rear wheels which I felt would be a decent match for the Slingshot (once repainted/powder-coated to match stock wheel colors or after the 2 stock fronts and the new rear were repainted/powder-coated to match each other) are these Mustang wheels from American Muscle -
    For the Base Slingshot S - Mustang 10th Anniversary Cobra Style Black Wheel - 17x10.5 (94-04 All) - Free Shipping. This 17x10.5" +28 mm Offset wheel has 14 spokes paired in a similar manner to the 16 spokes on the Base Slingshot. The shiny rim is the biggest difference and once recolored should look pretty good paired with the stock front base wheels. The wheel holds an affordable Nitto 555G2 315/35R17 which is almost an exact match for the diameter to the stock tire/wheel. The one problem for those with OCD is it has a +28 mm Offset causing it to center over 1" to the left compared to the stock wheel. I now have about 7000 miles on this tire/wheel combo and have not noticed any handling or nanny system problems. Unfortunately, the matching front wheel is a 17x9" +30mm Offset, moving the inside of the tire closer to the suspension components while also moving the outer edge of the wheel out about 1.5", possibly making trailering a tighter fit.

    For the Slingshot SL - Mustang FR500 Style Anthracite Wheel - 20x10 (05-14 All) - Free Shipping. This 20 x 10" +45 mm Offset wheel should easily accommodate a 305 tire and should offer a reasonably close match to the stock SL wheels once recolored and should fit w/o any problems since it has the same Offset. The matching front equivalent wheel is an 18x9" +30mm Offset wheel which shifts the wheel about .3" closer to the suspension while also moving the outer edge of the wheel about 1.25" further out, possibly making trailering a tighter fit.

    While I feel these wheels are a decent match stylewise to the Slingshot wheels, obviously, beauty is in the eye of the beholder (and their wallet).
    American Muscle also offers this wheel - Forgestar Mustang F14 Monoblock Piano Black Wheel - 18x10 1810F14BLK42545 (15-17 Ecoboost, V6) - Free Shipping. It's a Forgestar F14 wheel in 18x10 +42mm Offset wheel that's sort of a cross between an SL and a Base S rear wheel. It has 14 spokes instead of the base wheel's 16, but the spokes look closer to the SL wheel in how they're arranged. It will let someone add a 305/30R18 tire to the Base Slingshot S while being close enough in diameter to keep the nannies happy.

    AM sells this wheel for $360 w/free shipping. This wheel can be ordered thru other vendors in the desired wheel and Offset sizes need for the Slingshot at slightly higher prices.

    Quote from Slingrazor

    My rear tire is 28.45 and my fronts are 25.43.NO CODES on 2 different slings and have been running this way for over 18 months.
    Tires are Nitto 555G2.

    @Slingrazor Interesting you have 3.02 inch difference in the front to rear diameters. That's very good to know that you have run it on 2 different slings without issues.


    I'm going to check with my dealer to see if they can do an "ask Polaris" inquiry about wheel size requirements to not throw codes. Hopefully they'll get an answer.

    @BKL thanks for the info...
    I don't find the stock SL rims to be unattractive, I wish I could get the stock SL rim in 20 x 11 or 12. I have looked into widening the stock SL rim and with the widening and the offset it would be between $400 to $500 dollars.

    John
    2017 SL LE Midnight Cherry
    :COILOVERSS::TURBOSS::MOTOROILSS::FILTERSS::COLDAIRSS::DONKEYSS:

    I've considered this rim from Rohana in 20x12 that will allow me to run a 345


    As well as this one in 20x11 that will allow a 325


    I've actually wondered if I could just put either one in the back to see how well it would match to the stock rims, other then the 2 tone


    Here's the stock SL rim for comparison

    John
    2017 SL LE Midnight Cherry
    :COILOVERSS::TURBOSS::MOTOROILSS::FILTERSS::COLDAIRSS::DONKEYSS: