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drill/tap in frames
On Fri, 13 Jul 2018 16:41:16 +0200, Emanuel Berg
wrote: John B. Slocomb wrote: And the mid-bottom part of the down tube? The screws are interchangeable in size and length. Well that depends. Probably on the cost and class of the bike. The down tube is pretty thin on most better class road bikes. Say Perhaps .6 - .7 mm in wall thickness. Depending on whether it is butted, non butted, etc, These are not road bikes but ordinary standard steel frames for commuting, shopping, and everyday transport, say from the 80s. Sorry but road bike data is all I have :-) Yesterday BTW I saw a second bike with the exact same configuration. The bracket is bent so it is round along the tube surface, but what holds it in its place seems to be a single M5 screw with a flat PZ2 head. Given that all the pedaling torque passes through the bottom bracket I'd doubt if a new bike would use a single screw to hold the BB onto the frame tubes. What is held are two stays that then hold the chainguard. -- Cheers, John B. |
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