Built for how Sigmas actually get ridden — 70+ mph, heavy chassis, and a rear brake that has to work every single time. Complete rear circuit, no fabrication.
Stock Altis Sigma rear brake vs EBG Rear Brake Kit V2
| Aspect | Stock Altis Sigma | EBG Rear Brake Kit V2 |
|---|---|---|
| Stopping power | Baseline | Up to 30% more |
| Caliper & master cylinder | Stock 4-piston, DOT 4 | Genuine Sur-Ron Ultra Bee, DOT4 |
| Rotor | 220 × 3 mm fixed | 220 / 230 × 3.5 mm floating |
| Rotor features | Solid one-piece | Bobbinless floating, cooling grooves, 420J2 heat-treated |
| Line | Standard rubber | Steel-braided, PTFE core |
| Bracket | Cast / stamped | CNC billet 7075, anodised, 5 colours |
More steel in the disc means more heat absorbed before the lever goes long — that is where fade comes from, not lever effort.
Key specs
| Rotor | 220 or 230 mm floating · 3.5 mm · cooling grooves · 420J2 stainless, heat treated |
| Rotor design | Choose V2.1 or V3.0 (same size and material — V3.0 is the newer spoke pattern) |
| Caliper | Genuine Sur-Ron Ultra Bee 2-piston — not a copy |
| Master cylinder | Genuine Sur-Ron Ultra Bee |
| Pads | Semi-metallic, genuine Sur-Ron |
| Line | Steel-braided, PTFE core, DOT4 |
| Bracket | CNC billet 7075 · M6x68mm · anodised black, blue, galaxy purple, raw silver, red |
| Rotor guard | Rear rotor guard included with every kit option |
Which option?
Pick the option that matches what you already own:
- Brake Kit + Rotor V3.0 — everything in one box, newest rotor design. Our most-ordered option. ($369)
- Brake Kit + Rotor V2.1 — everything in one box, V2.1 rotor design. ($369)
- Brake Kit (No Rotor) — caliper, master cylinder, pads, braided line, bracket and rotor guard — keep your own 220 / 230 mm rotor. ($274)
- Brake Bracket Only — just the CNC bracket, anodised in your colour. ($119)
Move your mouse over a colour above and the photo switches to that finish.
Fits
Altis Sigma 2025 · Altis Sigma 2026 · Sigma MX — M6x68mm. Uses the factory mounting points — no drilling, no adapters. Some frames need 0.5–1.5 mm shim washers behind the caliper for dead-centre alignment; they are cheap and easy to fit.
Why riders swap it
Fade is heat, not effort. A 3.5 mm floating disc holds far more heat than the stock 220 mm rotor before the lever goes long, and the floating carrier lets it expand without warping. The genuine Ultra Bee caliper and master cylinder give a firm, consistent lever — the same parts Sur-Ron fits to its own bikes, not the copies flooding the market.
Bleed the system after fitting.
Keep pads and rotor free from chain lube and brake fluid — contamination causes noise and is not covered by warranty.
Unsure which one you need? Leave a note at checkout and we will check it before shipping.
















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