Actually found 2 new 27" aluminum rims - a front AND a rear - at the LBS this afternoon. A lucky find, I thought. The front wheel is a bolt-on type, like the one that was already on the Nishiki. That's okay - I get the feeling that this new tire and tube will last for a long time. This will be my first time adjusting cup-and-cone tension with a bolt-on wheel, but it looks easy enough. Thanks all, for the input here.