What is the difference between 700 x 35c and 700 x 40c please?
40c is wider than 35c.
My 35c tyres are 35mm wide.
Will the 40c be ok on a 622 x 17 rim?
Has that helped you? 35 and 40 are the widths in mm.
The wider the tyre the comfier it'll feel but the slower it'll go. Both widths (assuming you're putting them on a road bike), are *very* wide.
Most normal road bikes will have tyres between 23mm and 27mm with the vast majority going for 25mm, i.e. 700-25.
No. On paper alone you will probably have issues keeping the tyre on the rim.
Yes it has helped thank you. It's for a hybrid used for my commute which has a mixture of road, dirt track and muddy fields hence the need for something a bit wider than a road only tyre.
It came with 35c on these rims, would you advise against going over this size?
Ignore Samurai, it'll be fine - plenty of MTB rims have an ID of 17mm and will take 2.1"+ tyres. That's a standard road rim.
As others have said, the 'c' measurement is the width in mm. For the road 23 is the 'norm', although 25s are common on cheaper bikes and for use in winter.
I've used 42s on 17mm rims, IIRC. You should be fine.
All very helpful thank you. What size tube should I get for a 700 x 40c tyre on a 622 x 17 rim?
Size for continental tubes would be 700x32-47, you could probably get away with a bit smaller though so your existing tubes would probably be fine.