Well it’s bin maintenance time in Stumpy’s shed. ‘Hilda has had a bit of lurve. The chain was ‘well slack ‘ and rattley , and all the bushings seems to be loose.. The rear sprockets looked ok, but wasn’t going to risk it, so swapped those out. The sproccket teeth on the 170 mm chainset were like witches hats, except the 26t , as that was a recent replacement from a 30t. So I thought I’d look in the stores cpd. I dug out my Campag triple chain set, of 30/39/48, with teeth fit for a dental exam, and 175 mm cranks. Swapped the 30t for the 26 t. Fitted on extg bb, adjusted the front mech and cable pull, and went for a spin. Now I’d tried 175mm cranks last summer briefly ( for 1 ride) , but found I couldn’t spin as fast. Now tho, my boom is a tad longer than it was then, ( even taking into account the extra 5 mm of crank length, which means a 5 mm shorter boom), and initial thoughts were, hmm seems a bit odd. A 47 km ride 50% of into a “stiff” easterly, and I started to get used to it, and then the return leg, with an ‘up your chufferly’ and I found I could spin fine, just maybe not manically. I did give it some beans on the return, and my legs were a tad sore, but interestingly my knees were fine. I run 175 on everything else, and I am 6’’2”, so will see how it goes. Oh and I refitted the lower rack as well whilst the chain was off.