hobbitonabike
Formerly EbonyWillow
- Location
- Furness, South Lakes
My boy has a bike with 24" x 1.5" road tyres but I am struggling to find this size in nobbly tyres. I have found 24" x 1.75" and wondered if these would fit??
tyre sizing
- Thread starter hobbitonabike
- Start date
Page may contain affiliate links. Please see terms for details.
OP
OP
hobbitonabike
Formerly EbonyWillow
- Location
- Furness, South Lakes
Phew...thank you!!! You have saved the day Surfdude!!!
OP
OP
hobbitonabike
Formerly EbonyWillow
- Location
- Furness, South Lakes
They also have 40-507...could any one tell me what this means please??
Ern1e
Über Member
- Location
- ROSSENDALE LANCS.
If my ageing memory serves me correctly they are the METRIC sizes and as @surfdude states don't worry about that
OP
OP
hobbitonabike
Formerly EbonyWillow
- Location
- Furness, South Lakes
So confusing!! When you are new to it all lol. Thank you guys...I am soaking it all up like a sponge!!
Ern1e
Über Member
- Location
- ROSSENDALE LANCS.
Always remeber "IF IN DOUBT ASK ! "So confusing!! When you are new to it all lol. Thank you guys...I am soaking it all up like a sponge!!
second that . lots of helpful people on here .
OP
OP
hobbitonabike
Formerly EbonyWillow
- Location
- Furness, South Lakes
Cheers Surfdude!! I have noticed that it has them on the wrong way now!! Not our fault, they came like that! Tut tut wheelbase lol
OP
OP
hobbitonabike
Formerly EbonyWillow
- Location
- Furness, South Lakes
You guys are all fab! Learnt so much already
Ern1e
Über Member
- Location
- ROSSENDALE LANCS.
By that I take it you mean the direction of rotation ? if so depending on what make the tyres are and the use to which he is going to give them I would again not worry yourself overly on that.
OP
OP
hobbitonabike
Formerly EbonyWillow
- Location
- Furness, South Lakes
They have been like that for a while lol. They are Kenda Kwest that came with the bike. 
- Location
- Shrewsbury, Shropshire
That is the ETRTO sizing which is the better one to use than the imperial size as you are more likely to get the correct tyre. In your example it means a 40mm wide tyre to fit a 507mm diameter wheel.
The imperial sizing can be confusing as there are some older/more obscure sizes which are also called 24 inch but wouldn't be compatible with the wheels you have if you came aross them. (The same applies to 26" and 28" tyres)
You have a certain amount of flexibility in the tyre width but the diameter needs to match the wheel rim. Have a look at this PDF which explains about sizing and pretty much anything else you need to know about tyres. Hope it helps.
