Shimano Di2 GRX Groupset 1x12 42T

Marsoni

M251S

$812.46

Get it in 3 business days with 1 day shipping. Friday, May 29

Shimano Di2 GRX Groupset 1x12 42TGRX Single 42T 12 speed wireless groupset Includes Front Brake GRX Di2 12 speed STI bled with BR RX820 calliper, right front Rear Brake GRX hydraulic disc brake lever bled with BR RX820 calliper, left rear Rear Mech RD RX827 GRX Di2, 12 speed rear derailleur Crankset FC RX820 GRX chainset 42T, single, 12 speed, Hollowtech II, 175 mm Cassette CS M8100 XT 12 speed cassette 10 51T Chain CN M8100 XT Ultegra HG+ chain with quick link, 12 speed, 126L BT

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I have used these for years during the winter. The price has nearly tripled but the longevity is the same. I normally purchase three with one being a spare. Within a few weeks they start going. I switch batteries etc but normally that does not help. Its a great idea and my dogs love them but they dont hold up to 10 minutes of play each nite. We do not throw them either, I roll them or kick them as my dogs are older

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Reviewed in the United States on November 12, 2025

Verified Purchase

Mitchell LaForest

Lake Worth, US

★★★★★ 5

Great product

Very good. Hours of fun with the dog.

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Reviewed in the United States on March 3, 2026

Verified Purchase

Krispy