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@nneil
I just tried fitting a Schwalbe Snow Stud Tyre 700x38c (40-622) to my Alex Rims wheel (17-622). This rim had previously had a Specialized Borough XC 700x45c (44-622) as original equipment.
I fitted the tyre ultra carefully. I fully checked both sides for visible rim tape and inflated the tyre in stages using a Topeak digital pressure gauge to check pressure, in addition to the gauge on the track pump. When I reached 70psi the tyre blew off the rim and destroyed the tube. 70psi is the max rated pressure of the tyre for road use.
I refitted the original tire using a new Continental "Tour 28 All" tube (32/47-622/642). To add insult to injury the tube held 60psi (the tyre is rated to 85psi) and then developed a small hole or split in the seam on the inside of the tube in a ribbed section. (The rim tape is perfect - it's a bad tube).
The Alex Rim is marked:
CTD double wall
622x17
6061-T6
700
but I can't find it on the web (I know 6061-T6 is the alloy). It was OE on a Specialized Crosstrail.
The tyre has very little in the way of a raised bead. There doesn't seem to be much to hold it onto the rim. Much less than on the Borough XC.
The Continental tube is much smaller that the OE Kenda 45c tube that it replaced. Even though it can nominally cope with a larger size.
Have I picked the two worst products, or where am I going wrong?
I am so sad I have gone from a fully working bike to a dead one having used my spare tube. I have some more Continental tubes on order, but what's the point if they are no good. I thought Continental were supposed to be a top make. Likewise the tyre. Is it possible it was damaged by being shipped folded into a box? It doesn't seem damaged in that way.