New 20" MRR Z28 Style Rims for 1LE Showed up 2day!

[bub]

Picked up some 20" Z28 MRR rims for all season tires. Very nice.

Bob's House of Wheels, with black lug nuts, GM rubber stem TPMS and GM Z28 OEM center caps for $1,299 delivered. Stock sizes (10's front, 11's rear).

Mount and balance 4 - BF Goodrich A/S 285 35 R20's from Tire Rack on Monday at KC Trends here in KC.

[Dropspeed]

You are putting these on a 1LE? I am not a fan of the MMR wheels, which are cast and made in China,replacing the stock forged wheels. Driven on the street there "should" be no issues. If you plan to track the car I would highly recommend the stock wheels.

Matt

[bub]

Winter season street-only for the MRR's with all-season (<40 deg F) BFG's.

Keeping the forged stock rims with GY's in storage over winter. 2 complete sets of wheels and tires to swap seasonally.

[14Black1LESS]

Very nice and great price too. I plan on getting some of those eventually. Obviously not for track purposes, they just look badass.

[bub]

OK...got these all mounted and balanced up and installed them on the car tonight. Son and I started out for a test drive and we hear this clicking sound...click, click...pause...click, click...pause....


Hmmm...turns out the rubber valve stem TPMS was clipping the caliper balance counter weight thingys on the front calipers both sides by a fraction of an inch.

For now, we took some super sticky gorilla tape about 6" long and stuck the flexible rubber valve stem down towards the rim, essentially bending it away from the interference. Clears by like 3/16" now.

Not sure this is my best long term fix, but gets us back on the road. I know OEM TPMS is metal stem, so that may be lower profile than the rubber stem that came with my wheel set. Tried taking off the valve stem caps to buy some added clearance just to see if bare stem would clear, but even the bare stem still clips the weights. Crummy design placement of the stems back into the barrel of the rim if you ask me on these MRR's. Was a bit concerned about this when I bought them but figured surely they checked for caliper interferences

Anyone else run into this issue and how did you resolve it? Is there a low profile TPMS that clears the front calipers better?

Pics coming soon. of rims and temp solution with the gorilla tape to better illustrate the issue.

[Carmikaze]

You could Change your brake pads to eliminate the skates


Sent from my iPhone using Tapatalk

[bub]

[skipinminn]

Strange I ran my MRR's even with Caliper covers no PROB? But now my Cars a 2013 There might be the difference.

[Dropspeed]

You can do one of 3 thing to prevent the contact.

1. Install shorter valve stems.
2. Remove stock pads and cut "roller shares" "Mickey mouse ears" off. These are weights to avoid pad noise. I cut mine off when the car was new an did not notice any increase in NVH
3. Replace stock pass with aftermarket. I don't recommend this as the stock pads a Ferodo 1000 material that is very very good. I ran them on the track for a year and they where great.

Matt

[bub]

Originally Posted by Dropspeed

You can do one of 3 thing to prevent the contact.

1. Install shorter valve stems.
2. Remove stock pads and cut "roller shares" "Mickey mouse ears" off. These are weights to avoid pad noise. I cut mine off when the car was new an did not notice any increase in NVH
3. Replace stock pass with aftermarket. I don't recommend this as the stock pads a Ferodo 1000 material that is very very good. I ran them on the track for a year and they where great.

Matt

Matt:

I'm interested in 1., but House of Wheels sent me the rubber instead of metal stemmed TPMS. Not sure the metal ones are any shorter. Would need a side by side comparison to tell and the metal TPMS stemmed ones couldn't be tucked down like we did with these rubber ones if they were not. I was thinking maybe the rubber onese could be shortened somehow by removing a section of length out of the straight section of the rubberized stem itself (say 1/4 to 3/8") and re-sectioning with some threaded tubing...either internally threaded like the valve core threading...or externally threaded like the cap threads with a die??? Or just get 2 shorter rubber stems for the fronts if they exist for some other GM application.

[Silver/1lE13]

I installed my about six months ago, and no issues yet. I have the billet stems.

[bub]

Originally Posted by Silver/1lE13

I installed my about six months ago, and no issues yet. I have the billet stems.

Would you mind doing me a big favor? Take a close up pic of the stem in proximity to the roller skates and caliper illustrating what kind of clearance you are getting? May end up swapping out the front TPMS's only for billet stem sensors vs my current rubber stems (glad I have a TPMS reset tool). Would require a re-mount and balance though....

Also curious about clearances after the pads wear and the roller skates translate inward towards rotor due to the pad wear...

What a crappy location for a valve stem...right on line with the caliper, and in our case right in line with the outboard pad's "roller skates" balance counter weights

[Silver/1lE13]

I got this pic, hope it helps you out.

[ClawSS]

Originally Posted by Dropspeed

You are putting these on a 1LE? I am not a fan of the MMR wheels, which are cast and made in China,replacing the stock forged wheels. Driven on the street there "should" be no issues. If you plan to track the car I would highly recommend the stock wheels.

Matt

I value your opinion, so your statement also implies that stock SS wheels are also not something we should be tracking with using the same logic. I recognize and support the forged vs cast discussion under the substantial loads expected on track days and also recognize the decision of GM to go to forged or all "track-centric" models. With the MRR certifications on the 228's, do you not agree that they are equal to the stock SS wheels?