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ACS Maindrive Integrated Step-down Headset

Marsoni M251S
Sale price$41.00
Pay 4 payments of $10.25 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
ACS Maindrive Integrated Step-down HeadsetACS Maindrive integrated step down (AKA Reducer) headsets will suit mini to expert sized frames with an integrated 1 1 8" headtube and work with forks with a 1" steerer tube. Featuring an aluminum cap, bearing cover and crown race with super smooth rolling, precision 4545 bearings. Suitable for 1 1 8" integrated (41. 8mm) frames with 1" forks Crown Race: 26 S. H. I. S Lower: IS42 S. H. I. S Upper: IS42 S. H. I. S. Stem Clamp Diameter: 25. 4 Threadless
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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.
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4.9 ★★★★★
Based on 2444 reviews
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carlos febus
Lake Worth, US
★★★★★ 5
Good
Good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 27, 2026
W
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Will Rhoden
Natrona Heights, US
★★★★★ 5
Works as it should
Works as it should
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Reviewed in the United States on March 24, 2026
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Verified Purchase
kelly napper
Battle Creek, US
★★★★★ 4
Four Stars
Just what I needed
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Reviewed in the United States on October 14, 2016
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Verified Purchase
Paul Schneeman
New York, US
★★★★★ 5
Functioned as advertized.
Installed these in my Whalers 96 200 Offshore. No issues, used permatex gasket compound on aluminum engine parts after cleaning with fine brass wire wheel.
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Reviewed in the United States on November 20, 2024
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george mitchell
Port Orchard, US
★★★★★ 5
Fits 1988 Sea Ray V-135 2 stroke (Mercury)
For those of you with the 135 hp mercury that was branded as the "Sea Ray 135" and paint matched to the boat (i.e. Seville's and some others) this is the 147 degree thermostat for that motor. My Seville is an '88 and It's difficult to cross reference the serial numbers on those motors when searching for parts. Only buy Quicksilver parts for these motors. Happy to find them on Amazon because Boats.net as an example, is not clear on what you're getting.
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Reviewed in the United States on August 3, 2024

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