The Topstone Carbon is a versatile gravel bike whose signature feature remains its Kingpin rear suspension—a pivot-free flex system that requires specific upkeep. When properly maintained, this frame will handle thousands of mixed-terrain kilometres without complaint. Here are the points that make the difference on this model.
The Kingpin suspension, the heart of the bike
The Kingpin offers approximately 30 mm of travel via flex in the carbon stays and a single main pivot at the seat tube. This pivot rotates on bearings that deserve regular inspection.
- Check for lateral play by gripping the rear wheel and rocking it side to side.
- Listen for creaks out of the saddle: often a dry Kingpin bearing or a loose fastener.
- Clean the pivot area after every muddy outing; standing water wears bearings quickly.
A seized Kingpin bearing must be replaced; never force a pivot that resists, as you risk marking the carbon.
Standards and compatibilities you should know
Knowing your standards prevents buying mistakes. Here are the typical references for the Topstone Carbon.
| Component | Standard |
|---|---|
| Bottom bracket shell | BSA threaded (varies by year) |
| Seatpost | 27.2 mm |
| Rear axle | Through-axle 12×142 mm |
| Drivetrain | 1× or 2× depending on model |
| Max tyre size | up to 700×45c approximately |
These values vary by year and build spec. For your exact version, L'Atelier's mechanic AI will return the precise standard from your frame number without having to trawl ten forums.
Indicative torque values
Carbon does not forgive over-tightening. Always use a torque wrench and apply carbon paste to the seatpost.
| Area | Indicative torque |
|---|---|
| Seat collar | 5–6 Nm |
| Stem on headset | 5 Nm |
| Handlebar on stem | 5 Nm |
| Kingpin pivot bolt | per manual |
These are indicative values—verify for your version. Missing a detail? Our bike torque wrench reference table rounds out this foundation well.
