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@gbj_tester
He was planning to switch to a Thomson "to make up for the carbon bars", which made me wonder what defect in the carbon bars needed rectification by whatever putative advantage a Thomson stem holds over the one he already has.
The usually indicator of stem stiffness is stack height, since the torsional stiffness (the only important consideration, everything else looks after itself if you get that right) rises very fast as you increase the diameter of the extension tube, so making space for a bigger OD by going from 40mm stack height to 44mm can make a big difference.
In general, I agree with the other people who have said that switching to a Thomson will just be spending money to make the bike look worse without any material gain in performance.