The Avocet 20 computer I bought for the bike in the 80's still works perfectly.... You might have noticed in the pic that the front wheel is missing the sensor ring for it at the hub, but fortunately, I was able to find another one at eBay for this tubular wheelset a few months ago. I have a clincher wheelset that still wears the original sensor ring........ Problem is, the recommended modern replacement batteries you can buy now do not last as long as the original ones from the 80's. Last set I put in must have lasted only 6 months at most.