Mountain bike brake disc Black Friday: crossed-out prices

MTB Brake Disc on Black Friday: Three Points to Note

Despite its title, this page features discs, not complete brakes: those can be found among the bike disc brakes for Black Friday. A disc is replaced like-for-like, under three conditions:

• the fitting: six screws or Center Lock, and in this case a locking ring with internal or external splines depending on the axle and tool;
• the diameter, from 140 to 223 mm on this page, noting that the 200 mm and 203 mm do not require the same adapter;
• the thickness, suited to your caliper, like the HS2 from Sram, which is thicker than most discs.

Discounted Discs: Content and Build at Par

Before comparing two crossed-out prices, check what’s in the box: screws, ring, or nothing at all. A discount can only be judged on equal content, and then on equal build quality. So then look at the build: solid disc, floating, two-piece like the Centerline from Sram, or with an aluminium core like the Ice Technologies Freeza models from Shimano. For an electric Shimano STEPS MTB, the RT-MT800 with a magnet houses the speed sensor magnet in its ring, at the rear only.

Pads and Braking: Nearby Pages

Changing a disc is a chance to fit new MTB brake pads, to choose from those in the promotion, and to take a look at MTB braking during Black Friday. To replace a lever, also check the MTB brake levers in the promotion. Outside of Black Friday, end-of-line discs go to clearance and new references to new products.

Shimano, Galfer, Reverse: the Brands on This Page

Shimano offers the RT-MT800 with a ring featuring internal or external splines, in a magnet version for their electric MTBs, alongside the RT-EM910 and SM-RT64.

Galfer, Spanish specialist in braking also present in motorcycles, sometimes specifies the targeted brand in the reference, like this 200 mm Wave intended for Sram.

Elvedes lists the weight of several discs in their name, 85 g for the LX16, 120 g for the floating RX16.

Sram sells its Centerline in two pieces, screws included, and its HS2 in six bolts.

Reverse, a German component brand, offers the Delta in steel, in 203 and 223 mm.

Frequently Asked Questions

What is Black Friday?

It’s a shopping event that originated in the United States, occurring on the Friday after Thanksgiving. At Vélo-Store, it features discounts on equipment and parts, including these discs, and extends throughout the month of November.

When should an MTB brake disc be replaced?

When it falls below the minimum thickness marked on its surface, when it is warped to the point of rubbing, or when it has been warped by heat. Measure with callipers rather than by eye.

Can a larger disc than the original be fitted?

Yes, if the frame and fork can accommodate that diameter, with the corresponding caliper adapter. Check the maximum diameter recommended by their manufacturers.

Should the pads be changed at the same time?

It’s advisable: worn or glazed pads do not work well on a new surface. Pads contaminated by oil or fluid should be replaced in all cases.

How do you bed in a new disc?

On an open area, carry out a series of progressive braking from a moderate speed to almost a full stop, without locking the wheel. Braking improves as the pads deposit their material on the surface.