Why bike fit matters
A poorly fitted bike doesn't just feel uncomfortable — it leads to injury over time. Knee pain is almost always a saddle height problem. Lower back pain usually points to reach or handlebar height. Neck pain comes from too much drop between saddle and bars.
The good news is that most fit issues are adjustable without buying a new bike. Saddle height and setback are the two most impactful adjustments, and both can be made at home with a basic allen key set.
🪑 Saddle height — the most critical adjustment. Affects knee tracking and power transfer.
↔️ Saddle setback — fore-aft position over the pedals. Affects knee-over-pedal alignment.
📏 Reach — distance from saddle to bars. Determines back angle and shoulder load.
🔄 Crank length — matched to inseam to optimise hip angle and power.
Saddle height formulas compared
| Method | Formula | Best for |
|---|---|---|
| LeMond | Inseam × 0.883 | Road, gravel (most common) |
| Holmes | Inseam × 0.885 | Similar to LeMond, slight variation |
| Hamley | Inseam × 1.09 (full leg) | Road cycling |
| Greg Lemond (revised) | Inseam × 0.883 − 4mm for clipless | Road with clipless pedals |