Hello everyone,

I have a hybrid bike and would say that 75% of my riding is on paved roads. The bike came with Kenda Happy Medium Sport tires and I am thinking of replacements that have less rolling resistance and better puncture protection. I would not be opposed to a tire that is not as wide as what I have.

In looking at my rims and tires, I came across information that is confusing me, despite what I have been reading about the various designations.

RIM Markings: 622X17 700X18/23 ETRTO
Tire Markings: 42-622 700X40C 28X1 5/8

I know that for a given inner rim width, there is a range of tire widths that will work well, but given the above rim markings, I cannot figure out what the rim width would be. For the tire markings, I thought that the 42 was the width, but then I am seeing 700X40C, so is the width 40 or 42? 1 5/8" = 41.275mm, so I seemingly have three conflicting numbers to work with.

When looking at tires for this rim, I would be interested in knowing what sizes would fit. Also, is there a rule of thumb for sizing a tube to match a particular tire?

I am new to this and want to get it right.

Thanks!