Choosing between two Shimano hydraulic disc brake sets for your bicycle drivetrain brakes comes down to how much braking power you need and the bike you ride. The Shimano SLX BR-M7120 BL-M7100 4-Piston Ice-Tech set is listed at USD 219.99, while the SHIMANO Altus BR-BL-M315 MT200 set is listed at USD 61.48. Both are new hydraulic disc brake systems from Shimano, but they aim at different uses.
Quick verdict
If you are building a mountain bike and want a four-piston caliper with a two-finger lever, the SLX set is the one to choose. If you want a two-piston hydraulic system with a wider bike-type compatibility list and a lower listed price, the Altus MT200 set is the practical pick.
Comparison
| Product | Listed price | Price bar | Key details |
|---|---|---|---|
| Shimano SLX BR-M7120 BL-M7100 4-Piston Ice-Tech Hydraulic Brake Front/Rear Set | USD 219.99 | 4-piston postmount caliper; Japan; listed for mountain bike | |
| SHIMANO Altus BR-BL-M315 MT200 Hydraulic Disc Brake Set Bicycle MTB F&R OE | USD 61.48 | 2-piston caliper; Malaysia; universal bike-type compatibility |
The listed price spread is USD 158.51, and the two sets expose different levels of braking hardware. The SLX is centered on the BR-M7120 caliper and BL-M7100 lever, with reach adjustment, I-Spec EV compatibility, and One-Way bleeding. The Altus is centered on the BR-MT200 caliper and BL-MT200 lever, with a 3-finger lever and pre-filled brake oil.
Where the SLX set wins
The SLX set is the better match when braking force is the priority. It is explicitly listed as a mountain bike brake set, and the description points to a high-rigidity 4-piston caliper, ergonomic 2-finger lever, tool-free reach adjustment, I-Spec EV integration, and One-Way bleeding. It is also manufactured in Japan, while the Altus is made in Malaysia.
Where the Altus MT200 wins
The Altus wins on listed price and compatibility range. It is listed with universal, cargo, city, hybrid, mountain, and touring bike compatibility, so it suits mixed-use bikes more readily. The description lists a 2-piston caliper, 3-finger lever, pre-filled brake oil, approximate 630g weight, front hose 750mm, and rear hose 1300mm.
Product notes
Shimano SLX BR-M7120 BL-M7100 4-Piston Ice-Tech Hydraulic Brake Front/Rear/ Set
For a mountain bike build where 4-piston stopping power matters, this SLX set combines the BR-M7120 caliper with the BL-M7100 lever. The listed details include an ergonomic 2-finger lever, reach adjustment without a tool, I-Spec EV compatibility for shift lever integration, and One-Way bleeding. Brake hose lengths are front 900mm and rear 1600mm. The listed option is left for front and right for rear, with no rotor. The limitation is that the SM-RT70 rotors in 140, 160, 180, and 203mm sizes are listed as available separately, so the complete brake setup depends on the rotor you match to the caliper.
SHIMANO Altus BR-BL-M315 MT200 Hydraulic Disc Brake Set Bicycle MTB F&R OE
If your priority is a straightforward Shimano hydraulic brake set with a wide fit range, this Altus MT200 set is the one. It uses a BR-MT200 2-piston caliper and a 3-finger BL-MT200 lever, and is described as pre-filled with brake oil. The compatibility list covers universal, cargo, city, hybrid, mountain, and touring bikes, and the stated weight is around 630g. Front hose is 750mm and rear hose is 1300mm. The practical catch is that you may need an additional post mount or IS mount adapter depending on the rotor you use, and the adapter is noted as available separately.
Final choice by use case
Pick the Shimano SLX set for a mountain bike build when you want a 4-piston caliper and two-finger ergonomics. Pick the Shimano Altus MT200 set for city, hybrid, touring, cargo, or general mountain use when a 2-piston caliper and a lower listed price fit your plan.
