Speedometer Calibrator | Inline | Chevy/GMC 2500HD/3500HD (17-19)

Speedometer Calibrator | Inline | Chevy/GMC 2500HD/3500HD (17-19)

Marsoni

M251S

$199.95

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

Speedometer Calibrator | Inline | Chevy/GMC 2500HD/3500HD (17-19)Put the finishing touch on your lifted vehicle with Rough Country's Speedometer Calibration Device! This easy to use Speedometer Calibrator helps you quickly and easily reprogram your vehicle's speedometer to match the output of your larger tires. Your vehicle's computer is designed to track the speed based on your stock tire height. When upgrading to larger tires, there will be a discrepancy between your actual speed and the readout on your

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Solid mount. I’ve tried other ones but they don’t sit as nicely as this one. It also has a lot of adjustments to allow for using it any way you need it to so it is very versatile. The magnet strength is really good and holds my phone really well. Sometimes it feels too strong which I guess is a good thing. The charging works well but I wish the cable was a little longer

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Reviewed in the United States on April 9, 2026

Verified Purchase

Battle Creek, US

★★★★★ 5

Super easy to set up

Style: Screen+Charger, Style: Screen+Charger

I couldn’t be happier with this car phone mount—it’s easily one of the best accessories I’ve added to my vehicle. The build quality feels solid and durable, with a strong grip that keeps my phone securely in place even on bumpy roads. Installation was quick and hassle-free, and it holds firmly without slipping or needing constant readjustment. What really stands out is how easy it is to use one-handed. I can mount or remove my phone in seconds, which makes a big difference while driving. The adjustable viewing angles are perfect for navigation, and it doesn’t block my view of the road at all.

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Reviewed in the United States on April 17, 2026

Verified Purchase

Andrew

Lexington, US

★★★★★ 3

Poor socket design.

Style: Holder+Dash+Vent+Windshield

Overall this is a pretty decent phone mount. I have used it with both the windshield and vent mounts. The only problem I have is the design of the ball swivel. The socket contains a rubber piece to help increase the grip, but over time heat from the sun or the air vent makes the ball glue itself to this rubber piece. When you try to make an adjustment, the ball will not move in the socket and ends up breaking the socket. This is happened to me twice.

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Reviewed in the United States on November 13, 2025

Verified Purchase

Javier Garcia

Phoenix, US

★★★★★ 5

Great Phone Holder

Style: Holder+Dash+Vent+Windshield

I bought the version with the suction cup mount and I’m very happy with it. It holds my phone securely in place and doesn’t move around while driving. It’s also very easy to place the phone in the holder and remove it when needed. The suction cup sticks well to the dashboard, and you can position it so the phone stays in a safe, easy-to-see spot while driving. Overall, a great and reliable phone mount. Highly recommend!

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Reviewed in the United States on March 12, 2026