Box Two Cosine Chainring

Marsoni

M251S

$56.95

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

Box Two Cosine ChainringWhen you're hitting the sort of leg speeds modern day BMX tracks demand, you want the reassurance that your chainring will run true lap after lap. The Box Components Cosine 4 Bolt Chainring is made in the USA from durable 6061 aluminium with large square shaped cutouts around the perimeter to help save weight, 3 32" teeth with rounded tooth profile to reduce chain wear, laser etched BOX logos and a 4x104mm bolt pattern.

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Your Box Two Cosine Chainring 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]
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I love having heavy duty cable on hand for my cars. It's so nice to be able to make your own starter and alternator cables when restoring cars. These cables are 100% copper, not CCA (copper clad aluminum) like many others are. Copper is far superior for conductivity and handling higher loads. The rubber on the cable is thick and yet very flexible..it's clearly marked and seems very durable. I like to use a hydraulic crimping tool and then add marine grade heat shrink tubing with the adhesive inside of it to keep it as weatherproof as possible.

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Reviewed in the United States on May 10, 2026

Verified Purchase

N. A. Williams

Grantham, US

★★★★★ 5

89 mercruiser works fine

The mounting bracket was a little smaller than orginal, but no big deal, just drilled new hole in mounting plate. Solved my starting problem

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Reviewed in the United States on May 20, 2023

Verified Purchase

Charles R Gunther

Carnegie, US

★★★★★ 5

Direct replacement

Direct replacement for a failed solenoid on my Larson boat. Easy to install and works as it should.

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Reviewed in the United States on October 3, 2022

Verified Purchase

osborne

Pawtucket, US

★★★★★ 3

Working

Hard to find work great

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Reviewed in the United States on May 14, 2026

Verified Purchase

Jon

Lake Worth, US

★★★★★ 4

Did its job

Got me back onto the water. The mounting holes distances from center to center are less than original equipment. But in a pinch they will do the job.

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Reviewed in the United States on May 29, 2024