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upside-down U-shaped aluminium/aluminum down and top tube
The other day I saw something new, a Monark bike, an
aluminium frame only the tubes were oval. I thought, as this was an expensive black commuter bike with a Shimano hub dynamo light and all that, "surely they aren't aero on a bike like this", and felt the tubes, and I noticed that underneath both the top and down tube was an inward turn, with space enough for my fingertips to get in. The shape was that of an upside-down letter U for both tubes - they looked the same in that sense, but had different sizes. Anyone has a name for this and/or can figure out what purpose it might serve? Because it isn't even visible from the outside it can't be cosmetical, at least. -- underground experts exiled |
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