Overfast
OVERFAST 5grams Ultralight Battery Holder Cover for Colnago Y1RS | Carbon Fiber Shimano Di2 & Sram
OVERFAST 5grams Ultralight Battery Holder Cover for Colnago Y1RS | Carbon Fiber Shimano Di2 & Sram
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2026 July New version available now
OVERFAST kept pushing Y1RS to its lightest
- Designed for Colnago Y1RS (all versions)
- Material: Reinforced carbon fiber composite + Titanium screws
- Weight: 5.1g(Sram) / 10g±3% (Shimano)
- Color: Black matte
- Craftsmanship: High-precision CNC cut out from Carbon fiber block
- Note: Di2 battery is not included
- For Di2, comes with an additional battery holder replacement bracket
- Lazer with tightening line indicator
COLNAGO Y1RS Best weight loss accessories! Battery Holder！
Lightweight, but strong!
It can withstand more than 2000 extreme drop tests of 100 cm with battery weight. It takes dozens of kilograms to bend it. Enough redundant strength design, so you do not have any worries!
Direct CNC from high force compressed carbon fiber block, squeenze out every single drop of excessive epoxy to get untra lightweight carbon fiber. With smoothing edge lazer cutting technic, much stronger and stable than traditional hand layer epoxy technic, with much high quality control standard.
Simple installation, you just need to slide the screw to the scale line below and lock it!
Eliminate potential rattling from loose Di2 battery
All accessories include titanium screws, and the total weight is only 9g! You can save a lot of weight! If you replace the 2 original bottle cages+ battery holder and use 2 lightweight bottle cages, you can even reduce the weight by more than 80g.
Important Note:
Push battery cover to the lowest position before tightening
