REF-1039 · Patterson et al., 2003 · American Journal of Sports Medicine, · Paper · PubMed

After a 600-km ride, 23 of 25 cyclists had motor or sensory symptoms in the hands, regardless of experience or handlebar type

B-limited, mixed evidenceMeasured on trained to highly trained athletesWritten before October 2026, being re-checked

Key Findings

23 of 25 cyclists had motor symptoms, sensory symptoms or both after a 600-km ride.
Motor symptoms alone occurred in 36% of hands, with no difference by riding experience or by handlebar type (mountain bike vs road).
Sensory symptoms alone occurred in 10% of hands, mostly in the ulnar distribution and more often in mountain bike riders; 24% of hands had both.

Practical Application

On very long rides hand numbness and a weak grip are the rule, not a sign of a bad bike fit by themselves: expect them and plan for them.
The measures usually offered — changing hand position often, padded gloves, checking the fit — are the authors' recommendation, not something this study tested; say them as practice. Pressure data are in REF-1040.
Numbness or weakness that is still there days after the ride, clumsiness in the fingers or loss of pinch strength goes to a doctor.

Limitations

Small, one extreme event, no control group, no recovery data in the abstract. Abstract only was read.
No verified study links handlebar height, reach or saddle setback to hand load: advice on those is practice.