Best in 7 days
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- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 22 - Jul 27
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For Your Every Summer RSVP, with Code: SUMMER15
Description
MTX 831 Steel Rear Sprocket #428 (11-39K)MTX OE Steel sprockets are strong and durable, heat treated and hand finished for longevity. Front sprockets are constructed from SCM420 chromoly steel alloy where rear sprockets are constructed from C45 high carbon steel with a Zinc electroplated finish. Designed as an OEM replacement to exceed OEM specifications at a fraction of the price, making them your ideal cost effective solution for replacing old worn and warped sprockets. OEM replacement
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
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
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.2 ★★★★★
Based on 2150 reviews
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Product Reviews
★★★★★ 5
Long Johns
Size: Small, Color: Navy
Great fit, nice and warm!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 3, 2026
★★★★★ 5
Commfrotable and warm
Size: Large, Color: Dark Grey
Very light weight and comfortable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 12, 2026
★★★★★ 5
Right size item
Size: Small, Color: Light Grey
Make sure you order the right size. I received Small size & not Large. My fault. But, it still fit ok, a little snug, yet it made me feel warm when I went outside. I will be ordering a large size in the near future. Some one else in the family will get the small size item.
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Reviewed in the United States on February 11, 2026
★★★★★ 5
Warm
Size: XX-Large, Color: Black
13. Degrees at work this morning and with these as a base layer I was perfectly warm and comfortable.
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Reviewed in the United States on February 8, 2026
★★★★★ 5
I think I could have been OK with a medium instead of a large, but still warm and comfy !!
Size: Large, Color: Dark Grey
Very Comfortable, and warm!! Cold weather in PA this winter !!!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 11, 2026
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