


ACS Maindrive Integrated Step-down Headset
Marsoni
M251S
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
Quick Dispatch:
Your ACS Maindrive Integrated Step-down Headset orders ship within 1-2 business days.
Delivery Options:
- 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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★★★★★ 5
Does the job!
Color: Black
This added a beautiful space to my room! Very easy to install and includes everything you need to do so!
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Reviewed in the United States on January 28, 2026
★★★★★ 5
Quality
Color: Black
Beautiful….well made
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Reviewed in the United States on April 18, 2026
★★★★★ 5
Use all pieces included
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Hold good weight
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Reviewed in the United States on April 3, 2026
★★★★★ 5
Well made easy to install
Color: Pine
Well worth the cost easy to install look great
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Reviewed in the United States on February 11, 2026
★★★★★ 3
Just garbage
Color: White
Just terrible I put 2 screws on barely any problems but when I put 4 it got worse just awful and the anchor on one of the shelves couldn’t fit in seamless properly
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Reviewed in the United States on April 19, 2026