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GRK5 Racing Short Bumper Ver 2 [Shibata] R31S121
GRK5 Racing Short Bumper Ver 2 [Shibata] R31S121
GRK5 Racing Short Bumper Ver 2 [Shibata] R31S121
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GRK5 Racing Short Bumper Ver 2 [Shibata] R31S121

Marsoni M251S
Sale price$315.00
Pay 4 payments of $78.75 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
GRK5 Racing Short Bumper Ver 2 [Shibata] R31S121Product Description Our highly popular racing short bumper, designed specifically for the GRK5 nose cone, has been updated to the Ver. 2 model! This new product features a specially made carbon fiber material, custom made at a factory in Japan. It has been redesigned to be lighter and more compact than previous models. *This is a dedicated model that is only compatible with the aluminum nose cone of the GRK5 GRK5 R kit model.
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Your GRK5 Racing Short Bumper Ver 2 [Shibata] R31S121 orders ship within 1-2 business days.

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  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 2275 reviews
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Product Reviews
W
Verified Purchase
Wes B.
Lake Worth, US
★★★★★ 5
Fantastic!
Color: Light Grey, Size: Pack of 1, Color: Light Grey, Size: Pack of 1
Outstanding quality and incredibly easy to assemble! The back support is a perfect 10/10. I was debating between the M57 and the B100, and the B100 definitely won me over. The materials feel premium and durable. Highly recommended!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 4, 2026
S
Verified Purchase
Sidney
Omaha, US
★★★★★ 5
Worth it
Color: Black, Size: 21.7''D x 21.7''W*38.2''H
Easy to assemble, great quality for an affordable value. Very comfortable and sturdy product. The size and fit work for my currently standing desk set up.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 9, 2026
A
Verified Purchase
Abdellatef Hasan
Cuba, US
★★★★★ 5
Perfectly fits my needs
Color: Black, Size: 21.7''D x 21.7''W*38.2''H, Color: Black, Size: 21.7''D x 21.7''W*38.2''H
High quality, good looking, comfortable, easy to assemble, adult size, budget home office chair at a reasonable price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2026
T
Verified Purchase
Tara
Birmingham, US
★★★★★ 4
Great budget chair
Color: Black, Size: 21.7''D x 21.7''W*38.2''H
Great chair! I wish the arms were a little higher, but overall very comfortable and fit is great. Extremely easy to assemble by myself.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
P
Verified Purchase
Pamela Tarvin
Carnegie, US
★★★★★ 5
Great chair for the price.
Color: Black, Size: 21.7''D x 21.7''W*38.2''H
Great chair for the price. Very comfortable while working at my desk. Good quality and durable material. Easy to put together.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026

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