Originally Posted by
MTBerJim
Palms/thumbs. It's not new for me I get this on my mountain bike as well. That bike is a much more stretched out that the hybrid.
It's not weight so much as it's vibration.
This quote
the ulnar nerve becomes inflamed, usually either at the elbow or the wrist, when it has to absorb vibration and shock transmitted to the arm via some apparatus or tool (it can also flare up when the hand and arm are maintained in a fixed position for a long time). In the case of cyclists, shock and vibration are transmitted directly from the handlebars to the arms – and to the ulnar nerves in each arm, raising the risk of ulnar neuropathy.
sums it up nicely.
Padded gloves, bar ends (I'd go with a longer one then the Cane Creek or Ergon), softer grips (mountain bikes come with torture devices not handlebar grips
) and a more relaxed grip on the bars would help.
The added benefit of a relaxed grip is that you are putting less weight on the bars too.