I changed the inner tube last evening because the old one was leaking air constantly within a day since a week. Had an explosive puncture this morning and realised that it was the tyre that was the culprit.
I'm quite lost as to what sized tyre to chose from. I'll be buying one from decathlon. This is what's written on the tyre: 42-622 (28×1.60 700x40c). Any suggestions?
by Nomadic_PhD
2 Comments
The most reliable is the 42-622.
622 is the bead circle diameter (BCD), which is the diameter of the bead at the edges of the tyre’s casing. Whatever you buy must have this, or it won’t fit on your rim.
42 is the cross section of the tyre in mm. You have more flexibility here. You need to consider your bike’s frame. If you go bigger it might not fit in the frame or fork. Too skinny and it may not sit well on the rim.
My suggestion would be to replace it with a 42-622 tyre, but if one isn’t available, anything down to a 37-622 would probably be fine. Without seeing your frame, I wouldn’t recommend anything bigger.
All of those size numbers mean the same thing. Still to avoid any confusion, go by the ETRTO, as it’s the most standardized system. So that would be 42-622. When you shop for tires, make sure you see 42-622 and you’ll be golden!
For some context, 622 refers to the diameter of the rim, and 42 is the width of your tire. When you shop for a new tube, look for the same numbers. Tubes are meant to go with a range of widths, so just get one where 42mm is within the range.
Edit: if you’re running your tires with tubes, make sure you inflate them to the upper limit of pressure. Your tires say 35-65 PSI. Depending on your terrain, I’d probably stay closer to 60psi