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If You Haven't Done It, Try It | How I Started Downhill on a Hardtail — Unauthorized 33rpm 6th [Staff Bike Feature #03]
May 23, 2026
Downhill Was Fun When I Didn't Push It This is the third installment of our staff bike feature.T...
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400km Long Ride on an MTB | Why the ORBEA OIZ is So Fast [Staff Bike Feature #01]
April 13, 2026

The ORBEA OIZ M10 was introduced with the theme of "long ride x mountains." After completing a 400km long ride, it achieved a cruising speed of 30km/h, which is unbelievable for an MTB. Grumpy staff honestly review the capabilities of this versatile MTB, which comes standard with OQUO carbon wheels, the new SHIMANO XT, and FOX FACTORY suspension.
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MTB and drop bars combined! The KONA LBF demo bike is ready for test rides.
March 17, 2026
KONA's long-awaited new bike, the "LBF," has arrived! We also have a test ride bike available. K...
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[KONA UNIT X] The 2026 model has just arrived.
January 20, 2026
Hello, this is Ikeda from grumpy. We have a new arrival: the 2026 KONA UNIT X complete bike, an a...
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KYB to release MTB suspension! Pre-orders now open
December 8, 2025
KYB's MTB suspension has been attracting attention for the past year, with prototypes gradually ...
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Now's the time to buy your Orbea e-MTB or XC bike! December-only campaign information
December 8, 2025
If you're considering an e-MTB or a full-suspension XC bike, this is for you! This is a limited-...
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Are radial tires really that good? I rode downhill with the Schwalbe ALBERT.
November 1, 2025
To sum it up, it was incredibly good. Honestly, at first, I thought, "How much difference can a r...
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Transition I customized the new Sentinel.
September 14, 2025
Things I Want to Try While My Body Can Still Move Around the age of 40, a slightly melancholic t...
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If you want to fully enjoy your gravel or mountain bike, you have to go off-road! I had a blast on the cross-country course at Senishi Youth Travel Village!
August 22, 2025
The other day, I went with my cycling friends to run the cross-country MTB course at "Seranishi ...
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"Huh? Was TRP always this good?" - The Latest in Brake Technology
June 14, 2025
What comes to mind when you hear "TRP"? Do you imagine something like "a somewhat minor manufactu...
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We're excited to announce that we're now carrying Chromag from Canada!
May 18, 2025
Grumpy is now stocking Chromag, an MTB brand from Canada! Chromag is a brand that captivates fans...
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I'm reviving the Surly Karate Monkey that was gathering dust at home!
May 13, 2025
Hello, this is Ikeda. Mountain biking is so much fun! Ever since I saw young people with sparklin...
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