LEWIS X-Power Floating Rear Rotor for Surron Light Bee, 223mm, 54mm BCD

A floating rotor splits the job in two, with a steel ring taking the pads and a separate center bolting to the hub. On this LEWIS X-Power rear rotor for the Surron Light Bee, that split is the reason to buy it, so it helps to understand what it does and what it asks of you.

How the two-part design handles heat

The aluminum center acts as a heat sink to reduce brake disc temperature, while the 420 stainless steel outer stays separate from it. That separation is meant to prevent deformation at high temperatures, which matters on a heavy electric bike with a long downhill behind it.

Is a floating disc worth it over one-piece?

Ask how hard you work the rear brake before answering. As a general guide, riders who drag the brake on long descents have the most to gain from a floating disc, while someone riding flat, short routes may never push a one-piece rotor close to its limit.

Picking 2.3mm or 3.0mm at 223mm

Diameter is already settled because both sizes are 223mm, leaving thickness as your one decision. Let your caliper and pads decide it, and if the 3.0mm option will not pass through your caliper freely, the 2.3mm is the one to use.

• Outer: CNC 420 stainless steel
• Center: aluminum, working as a heat sink
• BCD: 54mm for the Surron Light Bee rear wheel
• Sizes: 223mm x 2.3mm or 223mm x 3.0mm
• Design: floating disc using the same materials as the HD series
• Inspection: look over the joint between ring and center at each pad change

A floating rotor deserves a closer look than a one-piece at service time. Clean it with brake-safe products and watch for any new noise from the rear as you bed the pads in on the fresh steel surface.

Specifications