Bike racks: choosing and installing

The three types of bike racks

Rear rack

The most common. It attaches to the seatstays and rear dropouts. You see it on 90% of city and touring bikes.

• Capacity: 18 to 25 kg depending on model
• Usage: side panniers, top bag, child seat
• Mounting: threaded eyelets (M5) on seatstays + rear dropouts. If your frame lacks eyelets, aluminum P-clamps can attach to the tubes

Front rack

Less common but essential for load balance during touring. Two sub-types exist:

• High rack (platform type): mounts on the fork, above the wheel. 10-15 kg capacity. Ideal for a basket or light bag
• Lowrider: panniers are mounted on each side of the front wheel, at mid-height. Lower center of gravity = better stability. 10-15 kg capacity per side

Seatpost rack

For bikes without eyelets (road bikes, some MTBs). Clamps to the seatpost.

• Limited capacity: 5 to 10 kg maximum
• Vibration: the lever arm on the seatpost transmits vibrations, the rack can "dance"
• Usage: backup solution, light bikepacking, errands

Mounting points: checking compatibility

Before buying, check these points on your frame:

1. Threaded eyelets (braze-ons): look for M5 threaded holes on the seatstays (2 pairs) and rear dropouts. A touring or gravel frame will always have them. A race frame rarely will
2. Tire clearance: the rack must not rub against the tire. Check for at least 10 mm clearance between the mounted tire and the rack structure
3. Disc brakes: some racks are incompatible with disc brake calipers (space constraints). Look for "disc brake compatible" models
4. Carbon fork: NEVER attach a rack with P-clamps on a carbon fork. Carbon cannot handle localized clamping forces — risk of failure

Panniers vs bikepacking

Step-by-step installation (rear rack)

1. Identify mounting points: seatstay eyelets (2 M5 bolts per side) + rear dropout eyelets (1 M5 bolt per side, often shared with the wheel)
2. Present the rack: place it on the frame without tightening. Check alignment with the rear wheel — it should be centered and level
3. Secure the lower stays first: the lower struts go on the rear dropouts. Tighten to 5 Nm (M5 bolt into threaded aluminum)
4. Secure the seatstay stays: adjust the strut length (often telescopic). Tighten to 5 Nm
5. Verify: spin the wheel by hand. The tire should touch nothing. Press down on the platform to feel for play — there should be none
6. Without eyelets: use P-clamps (aluminum collars). Tighten moderately — don't deform the tube. Place a piece of inner tube between the clamp and tube to protect the paint

Important: never exceed the maximum load specified by the manufacturer. An overloaded rack will fatigue mechanically and eventually break, often at the worst moment.

Materials: steel vs aluminum

• CrMo steel (Tubus Cargo, Surly): heavier (+200-300 g), but virtually unbreakable and repairable while touring (a local welder can fix a broken stay)
• Aluminum (Tubus Logo, Topeak): lighter, but not repairable if it breaks. Sufficient for daily urban use

L'Atelier helps you find the rack compatible with your frame — specify your bike brand and model to check mounting points.