I went and found some more 10mm zip ties of sufficient length - four different stores - rare little boogers - and tried to put the sensor on the Bridge Club. Short of building up the fork end I could not get the sensor and the magnet close enough. Two minutes to put it on the Pacer, five minutes to set the wheel size, time, and km/mph preference and I was on the road. I'll get another type for the Bridge Club. The Pacer has skinny tires and light Campy wheels and it was a lot more responsive than the Bridge Club, which is something of an ox. Anyway, thanks for the info and advice.