Wear Factors
What the 'What's driving wear' list on a prediction means, and what each factor measures.
Every personalised prediction explains itself with a What's driving wear list: the parts of your riding that are wearing the component faster than an average rider's would.
Where to find it
Open a component with a prediction (eye button on its row), then click the Personalised Prediction card to expand it. What's driving wear sits under the predicted date and adjusted lifespan.
Reading a factor
Each line has:
- A label, such as Weekly volume.
- A percentage: this factor's share of the extra wear. The shares add up to 100%, largest first.
- A detail line comparing your figure with the baseline, for example "136.2 km/week vs 70.0 km/week baseline (95% above average)".
Only factors where you're above the baseline are listed. If you're at or below average on everything, the list doesn't appear and the prediction will be on par with, or longer than, the manufacturer's rating.
The five factors
- Weekly volume: how far you ride each week, against a baseline of a typical recreational rider.
- Power / intensity: how hard you ride relative to a steady baseline effort.
- Climbing load: how much you climb for each unit of distance.
- Descending volume: how much you descend for each unit of distance.
- Weather exposure: how wet, cold and gritty your rides are, from the actual weather at your ride's time and place.
Why different parts show different factors
Each type of component is sensitive to different things:
- Chains and cassettes: weather exposure first, then intensity and climbing.
- Derailleurs: weather exposure, then climbing.
- Chainrings: intensity.
- Brake pads and rotors: descending, then weather (rim pads and rotors) or intensity (disc pads).
- Brake calipers, cables and fluids: weather exposure.
- Tires and disc-brake wheels: weekly volume, then climbing.
- Rim-brake wheels: weather exposure and descending.
- Suspension: climbing load, then descending.
Which factors actually appear still depends on where you're above average, so the same rider can see intensity at the top of the list for a cassette and descending at the top for brake pads. The same part on two bikes can also differ, because each bike's predictions use the rides on that bike.
What to do with it
The factors explain the rate. They aren't a warning or a score.
- Weather exposure high? Clean and re-lube the chain after wet rides, and check pads after gritty ones. Keeping the chain's lube reminder up to date also sharpens chain power loss.
- Climbing, descending or intensity high? That's how you ride. Expect to replace those parts sooner than the manufacturer says and let the replace-by date guide you.
- Weekly volume high? You ride more than most, so parts come round faster.
The list refreshes with the prediction, so a wet month or a big climbing block shows up in it.