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Water ingression into sealed hubs is a thorny problem which has taxed many brains and there is still no ultimate solution. We have tested slightly larger diameter caps with no noticeable difference. The problem is the width of the gap as dictated by the small lip at the bottom which presses against the inner bearing ring. We have tried reducing that but then there is the problem of production tolerances, which spill over into all the tolerances. The seat of the bearing for instance. Decreased tolerances always means increased price so we are constantly optimising all the parameters. As somebody said, an 'o' ring or sealing washer is another solution but that immediately increases drag, so you compromise again. The quality of the bearings is a factor, but we use NBK bearings which appear to be the best that Taiwan produce. Changing to Japanese bearings would double the price without, according to our tests, vastly increasing the lifespan.
We always try to achieve 'optimum design' and will continue to do so. Any suggestions are therefore always welcome.

You worried me then so I just double checked- Its correct 178.8 grams.

Weights:- Bare hubs (No bolts lockrings or sprockets)
Rear is 179 grams Front is 142 grams.
Yes, they are available singly front or rear and in pairs. Slightly cheaper as a pair.

Sorry to bump this but I thought I'd let you know that we do take notice of postings like this. The Tensile Fixed Hubs are now available as Double Fixed inc. two lockrings. We've also introduced it as a 28 hole as well as 32 and added a second colour, Red Anodised. Best of all still the same great price. All available at http://www.tensile.net
Just to correct a few statements, Tensile is nothing to do with Onza, but is a separate entity in its own right. Also the hubs are not made by KT, Joy Tech or any of the usual suspects and they are made in Taiwan, not China. We have close ties with our hub manufacturers in Taiwan and do work on designs ourselves. We have taken on board the comments about sealing and are working on those as well.
Mike Poyzer
Tensile Optimum Design