Roadtrek 210 Bigger Tire

[solidsnake]

Hi Everyone,

I know there a lot of threads of going to a bigger size of 265/75r/16, for those that have done this upgrade did you have to trim body mounts?

Thanks

 

[booster]

Hi Everyone,

I know there a lot of threads of going to a bigger size of 265/75r/16, for those that have done this upgrade did you have to trim body mounts?

Thanks

I don't know what you mean with "body mounts" as those are not in the wheel wells, at least on our van which is a 2007 190P. 210s basically the same in the front.

No trimming is usually needed to do the 265-75-16 on a Roadtrek, but be aware that there is one, and as far as I know only one, wheel that is wide enough for the 265 and also has the correct offset. It is a steel wheel from mid 2000s Silverado pickups.

The stock steel wheels are OEM and are the right offset, and the Roadtrek aluminum wheels are wide enough but are the wrong offset.

If you put the bigger tires on the Roadtrek aluminum wheels, which are -6 off set instead of stock +28mm you have 34mm, or 1 3/8" more outboard on each wheel. That makes the wheel travel on a larger arc around the lower ball joint and go fore and aft a bunch more as it turns, so you may start hitting the front ground effects or the rear wheelwell surface. At full turns it is often the swaybar that will hit if there is an issue.

If you move to 265-70-17 tires that are the same diameter, you would have a choice of two aluminum wheels from the same vintage pickups, Suburbans, etc. They are wide enough and the correct offset. The GMC version of them is on the our van in the listing pic on my post.

 

[solidsnake]

I don't know what you mean with "body mounts" as those are not in the wheel wells, at least on our van which is a 2007 190P. 210s basically the same in the front.

No trimming is usually needed to do the 265-75-16 on a Roadtrek, but be aware that there is one, and as far as I know only one, wheel that is wide enough for the 265 and also has the correct offset. It is a steel wheel from mid 2000s Silverado pickups.

The stock steel wheels are OEM and are the right offset, and the Roadtrek aluminum wheels are wide enough but are the wrong offset.

If you put the bigger tires on the Roadtrek aluminum wheels, which are -6 off set instead of stock +28mm you have 34mm, or 1 3/8" more outboard on each wheel. That makes the wheel travel on a larger arc around the lower ball joint and go fore and aft a bunch more as it turns, so you may start hitting the front ground effects or the rear wheelwell surface. At full turns it is often the swaybar that will hit if there is an issue.

If you move to 265-70-17 tires that are the same diameter, you would have a choice of two aluminum wheels from the same vintage pickups, Suburbans, etc. They are wide enough and the correct offset. The GMC version of them is on the our van in the listing pic on my post.

Thanks for the thorough response! Reason I brought up body mounts is because someone on the Facebook Chevy Roadtrek group mentioned he has to trim those when he went to the 265/75r/16. He has the Roadtrek 200 so maybe those differ on the front end compared to the 190/210. The aluminum rims you mentioned are those 17x7 and year range early 2000s? Separately did you tune your ecu for the bigger tire size?

 

[booster]

Thanks for the thorough response! Reason I brought up body mounts is because someone on the Facebook Chevy Roadtrek group mentioned he has to trim those when he went to the 265/75r/16. He has the Roadtrek 200 so maybe those differ on the front end compared to the 190/210. The aluminum rims you mentioned are those 17x7 and year range early 2000s? Separately did you tune your ecu for the bigger tire size?

The 200s were built on the previous generation cutaway vans and all the previous gen vans have a totally different front suspension and engine compartment. The current gen is from 2003 up and would have the LS engine like the 6.0L instead of the older gen 1 engines like the 5.7,8.1, etc. We had no issue with either the steel or aluminum wheels on our 07.

Yes, the aluminum 17X7 wheels would be about 2001 to 2010. For the wheel pix of the two you might want to go to Hubcap Haven website to look. Just use the wheel finder for an 05 Silverado for the Chevy version and 2005 Sierra for the GM version. Be sure to do the year update and the single rear wheel search modifications as they come up. That site has the best specs for wheels I have found. Scroll through the wheels until you find the right ones at 17X7, 8 bolt, +28mm offset.

The ECM will run fine fine with larger tires so no tune there. The speedo, at least ours, will go from reading 1-2mph fast to reading 1-2mph slow with the big tires. After a while I did go into the ECM and experiment a bunch to get the correct parameters for the 265-75-16 as it isn't an approved size for vans and the dealers couldn't do it. There are two parameters to change on one screen, and I do have the information in a discussion on this forum. Ours is now right on for speed and extremely close on odometer.

Here is my tire and wheel upgrade discussion when I went to the 17X7 aluminum wheels. Take heed of the warnings about replica wheels as they are not rated at a high enough load capacity for our vans.

Wheel and tire upgrade