Once again, in my hurry to build up Hornsby’s rear wheel, I neglected to weigh anything. When I weighed the previous wheel after removing the tire, that came to 1,595g — including the cogs. I haven’t mounted the cogs on the new wheel yet, so some math is in order.

With 196g for the inner tube and 464g for the Panaracer Fairweather tire, the new wheel works out to 1,092g. Adding back in 540g for the cogs yields 1,632g. That’s about double the weight difference seen for the front wheel, with nothing to account for it — same rim, spokes, tire and tube — except the bits of plastic holding the cogs (as seen in the photo above).

I’d worked out the weight for the old wheel with tire and tube at 2,406g. Adding the cogs to the new wheel’s weight brings it to 2,292g. As with the front, the slimmer tire is more than compensating for a slightly heavier rim than previously.