Do they stay in place while driving on and off on a cement garage floor?

No, they did not stay in place for me and my car - GT500. The ramp part is too high. For me, driving on/into them, I was able to finally get into them. But backing out of them was a complete failure. The rear lip is too high. I actually spun the rear tires trying to back out of them. The front tires would not roll out over the rear lip - too high. They slid along the garage floor. As the rear tires spun, the rear kicked out and slammed into the fronts. Simply a very bad design. "FLATSTOPPERS" from Race Ramps - the ramp is not as steep and the rear lip is not as high. They cost s little more, but they work!! Hope my answer helps.

maximum tire diameter? 20 inch?

Without measuring, I'd say at least 20" and a little wiggle room. Mine have last 3 years + without any issues and best of all. No flat spots on the tires. A great product.

what's the largest tire this will fit? I have 35x12.5r15 tires on my jeep.

It is 14 1/2 inchs wide. How wide is the tire?

Could I park a C6 corvette on these?

I bought these to fit under my 2007 SL550 Mercedes convertible(RWD) and they slipped out , actually shot out every time I tried to roll onto it. They are hard and slick. You may need to have a rough non skid floor or apply tape under. Yes I think your corvette would fit. I may consider a different brand.

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MAXSA 37353 ParkRight Prevent Flat Spots Tire Saver Storage Ramps Black 4PK | Prevents Out-of-Round Tires, Set of 4 each 21.5 x 14.2 x 3.4” Heavy Duty, Supports 10 Tons, Includes No Slide Pads, Black

MAXSA 37353 ParkRight Prevent Flat Spots Tire Saver Storage Ramps Black 4PK | Prevents Out-of-Round Tires, Set of 4 each 21.5 x 14.2 x 3.4” Heavy Duty, Supports 10 Tons, Includes No Slide Pads, Black

Product ID: 19303540

Details

Brand
Maxsa
Color
Black
Item Weight
22.8 pounds
Material
Polypropylene
Product Dimensions
21.5"L x x

📏21.5” x 14.2” x 3.4” size, 20% longer & twice as wide

🛑Anti-slip rubber feet for secure placement

🛞Supports up to 10 tons

$615.22

Duties & taxes included

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛞 Keep your ride flawless—because flat spots are so last season!

EFFORTLESS SETUP - Simple reverse and roll-on installation for quick, no-fuss tire protection
FLAT SPOT FIGHTER - Curved design keeps tires perfectly round during long-term storage
STAY PUT STABILITY - Non-slip rubber feet prevent any unwanted sliding on slick floors
HEAVY DUTY STRENGTH - Built from cross-ribbed polypropylene plastic supporting up to 10 tons per ramp
UNIVERSAL FIT ULTIMATE PROTECTION - Extra-large ramps fit nearly all tire and wheel types with ease

Maxsa’s ParkRight Tire Saver Ramps are engineered to prevent flat spots on tires during extended vehicle storage. Crafted from heavy-duty polypropylene with a reinforced cross-ribbed design, each ramp supports up to 10 tons. Their oversized dimensions and anti-slip rubber feet ensure universal fit and stable placement on any surface. Ideal for classic cars, RVs, and seasonal vehicles, these ramps preserve tire shape and extend tire life with easy installation.

Specifications

ASIN	B00U7HMZZO
Best Sellers Rank	#102,237 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #114 in Material Handling Ramps
Brand Name	Maxsa Innovations
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (482)
Global Trade Identification Number	00857170005027
Included Components	Park Right Flat-free Tire Ramps, 4 Pk
Item Dimensions L x W x H	21.5"L x 14.2"W x 3.38"H
Item Type Name	Park Right Tire Saver Ramps for Flat Spot Prevention and Vehicle Storage (Set of 4), Black (37353-BK)
Item Weight	22.8 pounds
Load Capacity	5 tons
Manufacturer	Maxsa
Manufacturer Part Number	37353
Manufacturer Warranty Description	Maxsa innovations, llc warrants to the original consumer/purchaser that this product shall be free of defects in material and workmanship under normal use and circumstances for a period of ninety (90) days from the date of original purchase for use. When the original consumer/purchaser returns the product pre-paid (consumer pays return shipping) to maxsa innovations, llc, 8412 cathedral forest dr;…
Material Type	Polypropylene (PP)
Model Number	37353
UPC	857170005027

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$615.22

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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