Is anyone running 30’s on a 2020 1000 4?Wanting to replace the factory wheels and tires with 30’s. What is the best option with a 15” wheel? What would the offset need to be in order to keep factory track?
First off, don't rely on the X+Y type offset, they are not accurate and different between manufacturers. I have a 2019 R but the idea is the same as far as offsets.
Fronts will need to be 50 mm or 45 mm offsets. These are commonly known as 6+1 and 5.5+1.5 but they are really not. With 10" tires you will be about 1.5" to 1.75"" wider up front.
Rear you have a couple options...
If you want to be exactly the same width as the front, use the same wheel and 1.5" spacers. This has the advantage of being able to rotate without dismounting the tires.
If you prefer not to use spacers, there are a couple flavors of 4+3 wheels.
0 mm offset (really a 3.5+3.5) in the rear will make you slightly wider in the rear.
15 mm offset (a true 4+3) in the rear will make you slightly narrower in the rear.
I personally do not like spacers that bolt on, especially when they are 1.5". Riding buddy has trashed his rear bearings with 1.5" spacers in just under 500 miles. Dealer will not warranty so be careful if you decide to run spacers. Also, I would need to remove my spacers when running my paddles and I didn't want to do that because spacers should be installed with thread locker and that would be a pain.
I am OK with thin spacers that sandwich between the wheel and hub so this is my combination that makes the front and rear exactly the same (1.75" wider than stock).
Tusk Terrabite Kevlar 30-10-15 on System 3 Bronze SB-4 Beadlocks. 45mm front offset and 15mm rear offset. 12mm billet spacers in the rear with 12mm longer studs...