Onyx Thru Bolt (20mm x 130mm)

Marsoni

M251S

$59.95

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

Onyx Thru Bolt (20mm x 130mm)Onyx manufactured aluminium thru bolt produced for Onyx front and rear hubs that utilise a thru bolt system. Available in different lengths to suit the most popular frames and forks on the BMX race market, they come in both 15mm and 20mm diameter. Every bolt includes 2x 2mm spacers. Use these thru bolts with any hub brand that requires a bolt system like this. Note: Physical axle spacing is 2mm less that listed size to allow for compression. eg, 117mm

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When I received it, it was so small that I thought it was a toy, or maybe for some 4cyl engine. It is significantly smaller than the original one. When I looked closer, the mount holes did line up, so I tried it. I did have to get shorter mount bolts. To my surprise, it works great! I don't know what the longevity will be, but it made it through a busy august! Considering the price and how small it is, I might just buy a second one to keep on board. Just in case.

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Reviewed in the United States on September 14, 2025

Verified Purchase

Bob Valentine

Chelsea, US

★★★★★ 1

Warning!!!

I was so impressed after install!! Fired right up faster that it ever has in the past, had the boat out about 8 times and CACK!!! They say they will stand behind the product and replace it, but do I risk another day ruined on the river? Btw, I have a Volvo penta 5.0 21.5' Larson I/O

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Reviewed in the United States on September 28, 2025

Verified Purchase

Maris I.

Belleville, US

★★★★★ 5

Perfect fit and functioning. Excellent support

The starter fit perfectly, in my Mercruiser 4.3 from 2004, although it was awkward to replace on my engine due to space constraints. I had a few questions for the supplier and quickly received very descriptive answers. Now the starter works perfect in my boat. In all a very good choice which I really can recommend others.

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Reviewed in the United States on June 27, 2024

Verified Purchase

A. WEAVER

Natrona Heights, US

★★★★★ 5

New starter

Part came promptly and was a direct match to the original starter. I did a bench test prior to install and had no issues.

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Reviewed in the United States on July 16, 2025

Verified Purchase

Roy W.