The MMM QS165 is a CNC-machined aluminum swingarm built in Minnesota as an upgrade for the Razor SX500 and MX500/650. It is designed around the QS165 5KW and 10KW motors, with mounting holes for smaller my1020 and FW11 motors still present, and it accepts tires up to 12 inches. Spacers and hardware are included, so it bolts on without extra parts. It suits owners pushing high power who have burned up smaller motors; the trade-off is that it is a single-purpose part tied to specific motors and frame, and belt-drive users on the 10.5-inch arm must wait for belt lengths.
In stock
Owners rate it highly, with 21 ratings averaging 5 out of 5. Feedback centers on the machined build and the ability to run bigger motors than the stock arm allows.
This is a custom-designed, CNC-machined aluminum swingarm upgrade for the Razor SX500 and MX500/650. It is made in Minnesota. The motor is not included and is sold separately.
The arm is built to use only the QS165 5KW and 10KW motors. The stock Surron motors use the same mounting points, so they should mount to this swingarm as well, but this has not been tested. The necessary spacers and hardware are included. Holes for the my1020 and FW11 motors are still in place for running a smaller motor. The largest tire it can run is 12 inches.
All swingarms are now version V5. All sides of the arms are machined, and some machining marks are expected. The shock brace is a solid, one-piece design. The right arm has a machined slot for the "one" motor and for longer-shaft motors such as the FW11. The 10.5 in arms are new, and belt lengths for them are still being worked out. A small bolt holds the brake adapter in place. Use thread lock on it and tighten it just enough that the adapter plate can still slide. The bolt is optional.