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25.4 to 28.0 will work, the slot will open up by about 2mm but that's acceptable. SJSC have them in stock https://www.sjscycles.co.uk/seat-posts/262-humpert-seat-post-shim-254mm-id/
gbj_tester
@MCamb
Not having much luck finding a shim that has a 26.0 id- 28.6 od (1.3mm wall thickness?) should I make my own? Is there a smart / hack way to do this?
For a stoker stem on a tandem