Do these need to be attached to the floor?

No. They are listed as heavy enough that they do not need floor attachment.

What tire size are these for?

This set is for large tires from 27 in. to 40 in. diameter.

Specifications

Brand: Part Smart
Part #: XXXACP95210
Item #: XXXACP95210

Part SmartItem #: XXXACP95210

Park Smart Tire Saver Ramps Set - Set:Lg. Tire - 10in. wide/Set of 2

Name: Park Smart Tire Saver Ramps Set - Set:Lg. Tire - 10in. wide/Set of 2
Brand: Part Smart
SKU: XXXACP95210
Price: 113.95 USD
Availability: InStock

$113.95

Usually ships the next business day

Park Smart Tire Saver Ramps set of 2 for large 27-40 in. tires, 10 in. wide, made from solid PVC to help prevent flat spots.

Key Features

Set of 2 tire saver ramps.
For large tires 27-40 in. diameter.
10 in. wide ramp size.
Solid PVC construction helps prevent flat spots during storage.

Set

Stnd. Tire - 10in. wide/Set of 2 Lg. Tire - 10in. wide/Set of 2(+$2)

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About this part

Product Details

Park Smart Tire Saver Ramps support stored vehicles so tires are not sitting on one hard flat spot for months.

This set of 2 large tire ramps fits 27-40 in. tire diameters, is 10 in. wide, uses solid PVC, and has ribs on top and underside for tire and floor grip.