Co-op Cycles ADV 2.1 Brakes: Identify the Mechanical MD-C550 System

Co-op Cycles ADV 2.1 brakes are described as mechanical discs in the saved item 254161 record. The named Tektro MD-C550 calipers, compressionless housing and 160 mm rotors form a more useful identification list than a seller's generic “disc brakes” description. They do not establish the condition of an individual bicycle.

Identify the Co-op Cycles ADV 2.1 brakes by their full entry

REI's Brake Type field says Mechanical Disc Brake. Its detailed line names Tektro MD-C550 flat-mount mechanical disc, while the features call the design dual-piston. Keep those descriptions associated with the caliper; mechanical actuation is not a hydraulic-fluid specification.

Disc describes the braking arrangement without identifying every part of it. A used listing that shows a disc rotor still leaves the installed caliper and controls to be identified. Request legible component markings when they differ from this saved equipment record, rather than resolving the discrepancy from a distant photograph.

Keep pads, rotors and housing in separate fields

The same brake line specifies metal/ceramic pads and 160 mm Tektro six-bolt rotors. Those descriptions answer different component questions. The rotor's nominal diameter is not a caliper-mount dimension, and a six-bolt label is not an installation torque.

Compressionless brake housing is explicitly listed. That is part of the documented cable-system package, without being a replacement-housing procedure or a quantified braking result. The source's feature language about braking feel should not be turned into a stopping-distance claim for a bicycle whose parts and condition have not been inspected.

Use identification before discussing service

For a workshop enquiry, provide the bicycle identity, actual caliper markings and any known component changes. State whether the question concerns the original recorded assembly or something installed later. The published pad description does not approve every replacement pad carrying a similar material label.

No adjustment, bleeding, bedding-in or rotor-upgrade instructions follow from this table. The historical ADV photograph supplies brand context rather than a brake inspection. The Co-op brand introduction and model topic keep the named bicycle family attached to the enquiry.

FAQ

Does this record describe hydraulic calipers?

No. It expressly identifies a mechanical disc-brake system.

What rotor diameter is listed?

The saved brake entry specifies 160 mm Tektro rotors.

Does the pad description approve a substitute?

No. A replacement still requires the actual component match.

Sources

• Manufacturer record saved 4 November 2026; reread 6 November: ADV 2.1 item 254161 (https://www.rei.com/product/254161/co-op-cycles-adv-21-bike).

Photograph credits and permissions

Photograph 1

Original title: New Bike Day

Creator: Matthew Bellemare (bellemarematt); creator profile: https://www.flickr.com/people/bellemarematt/

Copyright notice: No separate photograph copyright notice supplied. Embedded sRGB colour-profile notice: Copyright (c) 1998 Hewlett-Packard Company.

Original source URI: https://www.flickr.com/photos/bellemarematt/54472185594/

License / permission: CC BY-SA 2.0

License / permission URI: https://creativecommons.org/licenses/by-sa/2.0/

Modification notice: Original source-hosted JPEG retained byte for byte for this article. Source-described earlier photographic process: Nikon N80 | Nikon AF Nikkor 28mm f/2.8D | Kodak Vision3 500T @ 800 Digitized with Sony a7R III & FE 90mm f/2.8 Macro G OSS | CineStill CS-LITE | Valoi 360 135 Holder Home developed in Fujifilm Negacolor | 4:18/35C | Paterson Tank, AGO Film Processor Negative Lab Pro v3.0.2 | Color Model: Basic | Pre-Sat: 3 | Tone Profile: Linear Deep | WB: Auto-Neutral | LUT: None Embedded XMP additionally records conversion from Sony ARW to TIFF and TIFF to JPEG, with Adobe Photoshop Lightroom Classic 14.2 (Windows) saves on 22 April 2025 at 12:07:50 and 17:11:39 -04:00. It records exposure +0.14, whites +11, incremental temperature +2 and tint -6; distortion, lateral chromatic-aberration and vignette correction already applied. Crop angle is 0 and HasCrop is false. These are source metadata statements, not alterations made here.

Source disclaimer: No endorsement by the photographer, REI or Co-op Cycles is implied. No warranties are given; other rights may apply. The depicted bicycle is dated photographic family context, not proof of the current ADV 2.1 specification, manufacturing year, maximum load or fit. Share adaptations of the photograph under the applicable ShareAlike terms.