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6

Frame tubing is generally standardized by external diameter to imperial dimensions in increments of 1/8 inch, which makes it a lot easier to standardize things like front derailleur clamps. Seat tubes therefore tend to have external diameters of 1 1/8” (28.6 mm), 1 1/4” (31.8) or 1 3/8” (34.9 mm). Handlebars are similar. Though there has been more variation ...


3

The dimensional differences have to do with purpose of the individual part. The seat post outside diameter has to match the seat-tube inside diameter.If you are asking why they didn't make it .2mm thicker it was a design decision. Based solely on an engineers experience or opinion. It may have been because they wanted a thicker wall on the seat tube or they ...


1

I disassembled two that were readily available, one on a Giant and one on a Specialized. Both use an M8 x 18mm. The 18mm length dimension did not include the head of the bolt. The total length was 24mm. I also noted both bolt heads were slightly shorter than industrial standard. Visually it looks like a bolt with a taller head would work but 1/2 head would ...


6

Looks to me like Shimano CI Deck gear indicators. They connect to the shifters with a little cable that pulls a dial to tell the rider what gear they're using. https://si.shimano.com/pdfs/si/SI-6XJ0A-000-ENG.pdf From the user's view:


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