Brother Cycles Big Bro Thru Axle Dropouts
These Brother Big Bro sliding dropout plates allow a compatible frame to use a Maxle-spec thru axle rather than quick release. Brother specifies compatibility with Big Bro models up to and including 2024; later rail-style dropout frames use a different arrangement.
The axle specifications listed are 12x142mm with a 174mm axle length, or 12x148mm with a 180mm axle length, both using an M12x1.75 thread. Choose the axle specification required by the frame’s hub spacing rather than treating the two lengths as interchangeable.
Mounting bolts and washers are included. This listing is for the sliding dropout plates and their fixings; it is separate from the replacement thru-axle product. Check the existing frame generation and required axle standard before ordering the conversion hardware.
Frequently Asked Questions
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