Numb hands on the bike usually mean ulnar-nerve pressure at the heel of the palm.
Rotate the bars up two degrees before you buy a new stem. It's the change a fitter would try first.
What's actually going on.
The ulnar nerve passes through a narrow channel (Guyon's canal) at the heel of your palm. When you put weight on that part of your hand for an hour or more — particularly with the wrist bent back — the nerve gets compressed and your pinky and ring finger go numb. Most cyclists' hands hurt because the bars are set up to put weight at exactly that spot. Rotating the bars up takes pressure off the heel of the palm and shifts it to the meat of the hand.
Handlebar palsy (ulnar neuropathy at the wrist) is common among distance cyclists, particularly on long rides over rough surfaces where the rider keeps weight on the lower part of the palm. Source: Clinical literature on cycling-related peripheral neuropathy identifies the ulnar nerve at Guyon's canal as the most common site, with handlebar shape, hood position, and bike fit as primary contributors..
Rotate the bars up 2–4°.
The first adjustment a fitter would try, taken straight from the BikeFit app.
On drop bars, this means rotating the bars so the bottom of the drops is closer to horizontal and the hoods sit slightly higher. On flat bars, this means a small upward tilt of the entire bar. The change shifts your hand contact point away from the heel of the palm and onto the wider, padded area of the meaty thumb base. Try it before changing stems or grips.
If the first one didn't fix it, here's the rest.
Each step routes based on whether the previous adjustment helped. The app never repeats the same direction it just tried.
- 1Bar rotation. Rotate up 2–4°. The single highest-yield first move.
- 2Bar height. Raise the bars 5–10 mm. Reduces forward weight on the hands.
- 3Reach. Shorten the reach by 5–10 mm (shorter stem, or saddle forward) if rotation and height don't fix it.
- 4Bar tape / grip. Thicker bar tape or padded gloves help but treat the symptom, not the cause. The app tells you when this is appropriate.
- 5Bar shape. Compact-drop or shallow-drop bars suit smaller hands. Last resort, not first.
Most cyclists resolve the symptom within these 5 adjustments. If you've worked all of them and pain remains, BikeFit tells you so and recommends a professional fitter or healthcare provider.
Try the first adjustment tonight. Ride tomorrow. Know by Saturday.
$4.99 one-time. Apple's standard 14-day refund. No subscription, no tracking, no waiting for a fitter's calendar.