BFGoodrich | KR3-SR | 40x12.50-17 | Rock Racing

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  • BFGoodrich | KR3-S | 40x12.50-17 | Racing Tires at Reno Off-Road
  • BFGoodrich | KR3-SR | 40x12.50-17 | Rock Racing
  • BFGoodrich | KR3-S | 40x12.50-17 | Racing Tires at Reno Off-Road
  • BFGoodrich | KR3-S | 40x12.50-17 | Racing Tires at Reno Off-Road


BFGoodrich designs and produces some of the toughest, most competitive off road racing tires on the planet. 

BFGoodrich KR3-SR 40x12.5-17 

The latest iteration of the legendary BFGoodrich Baja T/A the KR3-SR (Soft Rock) is designed to tackle the rocks, dry lake beds, and valleys of Johnson Valley, CA home of the legendary Ultra4 King of Hammers each February.  The KR3-SR takes rock climbing, steering response and puncture resistance to the next level for unlimited Ultra4 Class 4400 rock racing racing vehicles.  Using the race wining Baja T/A KR3 as the foundation the KR3-SR evolves with supple sidewalls for climbing and an aggressive tread pattern to take all the desert can throw at it.


  • Tested and raced by multi-time KOH winner Jason Scherer the KR3-SR won KOH overall in 2018, 19, and in 21 with Randy Slawson/Bomber Fabrication.
  • 44% increase in number of biting edges vs 39″ KR2
  • 1.25 inches taller than KR2, 1 inch narrower
  • More progressive traction, more predictable lateral grip vs KR2
  • Significantly improved comfort (and speed) through bumpy terrain
  • Full-color BFGoodrich sidewall applique
  •  KR3-SR is a non-DOT off-road competition tire not legal for highway use; including chase vehicles.  It is a dedicated race tire designed for off-road surfaces only.








> Winner 2018 Ultra4 King of Hammers – Jason Scherer
> Winner 2019 Ultra4 King of Hammers – Jason Scherer
>  Winner 2021 Ultra4 King of Hammers – Randy Slawson


MSPN                SIZE                              MODEL
27949               40×12.5R17               Baja T/A KR3-SR       Soft Rock for Ultra4 unlimited class 4400


Designed, engineered, and Made in the USA.



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Warranty Information


Customer satisfaction is our top priority. We accept returns on unused products, buyers have decided against after receiving, on a case by case basis. Contact us if you ordered a product that you have since decided against, and we will do our very best to get it returned or exchanged.

BFG Racing tires that are DOT & Non-DOT approved, are an off-road racing style tire that we work closely with BFG racing to resolve issues on. The returns process is on a case by case. Manufacture defects are covered however. We will work directly with BFG Racing to resolve any defects for our customers.

Returns may be charged a 5% to 15% handling fee. Not all returns will be charged. This is determined on a case by case basis.

Any unused merchandise in the original packaging may be returned within 10 days of the original purchase date, or received date depending on the shipping timeline. There are no returns on electrical items, special orders such as build to order products. Discontinued items will be evaluated to determine if the product can be returned. No returns will be accepted of damaged (by user) or used items.

Return request need to be submitted using the attached form, so we can issue an RMA. Please include original packaging and a copy of your invoice or receipt.

For more information or any other questions you may have, please call us at 1-75-553-8333 or email during normal business hours 8:00am to 5:00pm PST Monday to Friday

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