For delivery estimate

RubberMaster Rib P508 18X8.50-8 B/4PLY

Lawn&Garden/Golf Cart
Lawn and Garden

Rims Not Included

easy test score

7.8 Great

Availability

In Stock

Per Tire:

$35.60

Lightning Savings

Was $44.5

Estimated Delivery

Shipping Cost

Installation available

Total

See full specs

Authorized distributor of

Local installation

1,000s of locations

US based customer support

Se habla español

About the Manufacturer:

RubberMaster has been proudly in business since 1976. Built on a foundation of quality products and superior customer service, they have grown from humble beginnings in the retread industry to a nationwide and Canadian-serving wholesaler operating in both B2B and B2C markets. Their Midwest-rooted headquarters powers state-of-the-art logistics, ensuring reliable distribution across North America. In a fiercely competitive industry, they set themselves apart with their exclusive proprietary brands: RubberMaster tires, MASTER ATV tires, SteelMaster wheels (white, black, and silver), and RubberMaster Plus inner tubes.

Chat

Start chat

Call

(855) 770-3279

We can help! Our trained experts have years of tire fitment experience and are available to answer questions.

Name

Brand

Size

Price

Easy test score

Specifications

Specs

Value

Description

Sidewall

Not Available

Describes the sidewall appearance. Examples: BSW= Black Side Wall, WSW = White Side Wall, OWL = Outlined White Letters.

Load Index

Not Available

The load index (LI) is a 2- or 3-digit number that correlates to the maximum amount of weight the tire can carry. For example, a tire with a load index of 87 indicates that the tire can carry a maximum load of 1,201 lbs. In this particularly example, 4 tires (each with a load index of 87) can carry a maximum of 4,804 lbs. Refer to your vehicle owner's manual for the recommended minimum load index.

Speed Rating
A guide to buying tires

Not Available

Speed rating (SR) indicates the maximum speed the tire can achieve. Higher speed ratings are typically associated with better handling capabilities. Refer to your vehicle owner's manual for the recommended minimum speed rating.

Load Range/Ply Rating
Types of tires

B/4PLY

Ply rating, more commonly referred to as load range, represents the strength and durability of the tire. Higher ratings may indicate your tires can handle heavier loads.

UTQG

Not Available

To help consumers evaluate their tires, the U.S. National Highway Traffic Safety Administration (NHTSA) created the Uniform Tire Quality Grading System (UTQG). The UTQG rates tires are rated on their tread-wear, traction performance, and temperature resistance. The grade for each of these can be found on the sidewall of your tire (except for winter tires and certain light truck tires). Click here to learn more.

Max Single Load(lbs)

815

The maximum load this tire will support. Remember to multiply this number by the number of tires installed on your vehicle to get the maximum carrying capacity. This number is directly related to the Load Index.

Max Single Air Pressure(PSI)

The maximum air pressure this tire will support. This does not represent the amount of air pressure your tires should have at all times. Consult with your owner's manual to determine the best air pressure you should use for your vehicle.

Tread Depth

6.0

The amount of tread on the tire. Once the tire is worn to 2/32nds, it is considered fully used and should be replaced at that time. Most tires will have tire indicators in the grooves of the tire to help you determine when the tires are worn down to 2/32nds.

Tread Design

Nondirectional

The pattern of the grooves, lugs, voids, and sipes on a tire's surface. This design affects the tire's traction, handling, and noise characteristics. Common types include symmetrical (uniform pattern across the tire), asymmetrical (different patterns on the inside and outside for varied road conditions), and directional (designed to rotate in one direction for improved wet traction and hydroplaning resistance).

Rim Width Range

Not Available

The approved wheel rim width range this tire will support.

Measured Rim Width

Not Available

The recommended wheel width as recommended by the tire manufacturer to get the best wear us performance for this tire.

Section Width

8.5

The measurement from sidewall to sidewall.

Tread Width

Not Available

The measurement from one side of the tread to the other side of the tread.

Overall Diameter

17.4

The height of the tire when fully inflated.

Manufacturer Part Number

450340

Manufacturer part number (sku)

Financing

You can pre-qualify to finance your tires, or you can simply choose Affirm at check-out. Fill out your information and choose the monthly payment that works best for you!

Select 3, 6 or 12 monthly payments, with rates from 10% - 36% APR. 18 months financing available for orders over $1000.00

Checking your eligibility won't affect your credit. You will receive an immediate answer from Affirm.

Affirm has no hidden fees or costs and is completely secure.
Quick and easy, real tire financing, real fast! You can apply in advance and know you can shop for tires when you are ready.

To learn more visit Buy With Affirm or read their convenient Affirm FAQ's. All credit decisions are made by Affirm.

To contact Affirm regarding your account, please call 1-855-423-3729.

No hidden fees

Affirm has no hidden fees or costs and is completely secure

Flexible

You choose the payment schedule that works for you

Quick and easy

Fill out your information and get a real-time decision

Pay over time

Choose the payment plan that works best for you

Learn more about Affirm tire financing options

No Credit? No problem!

Lease your tires with Katapult!

With a small down payment, and easy payments you can lease your tires. Payments are coordinated with your payday. Read more here about how Katapult works.

No credit required

Simple initial payment

No late fees ever

Payoff early is desired

Learn more about Katapult lease-to-own tire financing

Size Details

Size	UTQG	Load Range/Ply Rating	Overall Diameter	Section Width	Rim Width Min	Rim Width Max	Rim Width Meas	Tread Depth (in)	Max Single Air Pressure (PSI)	Max Single Load (lbs)	Max Dual Air Pressure (PSI)	Max Dual Load (lbs)	MFG #
11X4.00-5	-	B/4PLY	11.3	4.2	-	-	-	2.0	46	330	-	-	450051
13X5.00-6	-	B/4PLY	13.0	4.8	-	-	-	2.0	40	440	-	-	450150
13X6.50-6	-	B/4PLY	13.2	6.2	-	-	-	3.0	28	460	-	-	450154
15X6.00-6	-	B/4PLY	14.1	6.0	-	-	-	4.0	30	570	-	-	450190
16X6.50-8	-	B/4PLY	16.4	6.6	-	-	-	3.0	28	620	-	-	450310
18X8.50-8	-	B/4PLY	17.4	8.5	-	-	-	6.0	22	815	-	-	450340