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Ignore my last post, just nipped out and had a look mine are 600x12 but i had to lift the fender to fit them

Ive got 700x12 on the back of Shak'in horse on narrow rims but i had to lift the fender back and front

I guess the repair shop that originally had that manual, must have been one that actually paid the yearly upkeep charge. Here are some pictures of the O&R tools in a garden equipment catalogue from 1967. David

According to a post on this site; http://www.collectorsweekly.com/stories/32713-a-pony-express-bicycle-engine Advanced Engine Products went out of business shorty after changing the name of the bicycle engine from Chicken Power to Pony Express. Note the change of address in Webhead's Pony Express brochure from Los Angeles, California to Eden Prairie, Minnesota. There was a TV ad for the Chicken Power bicycle engine, it can be found on youtube here; https://www.youtube.com/watch?v=RNtHBEdZDYs Here is an ad for the Pony Express bicycle engine from Popular Mechanics magazine May 1978 that was scanned by google. David