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Wheel size tends to go with the type of bike. Road bikes tend to standardise on 622mm rims (aka "700c" - don't ask) Mountain bikes tend to have 584mm rims (aka "650B" - no, really, don't ask). I think these are roughly 29" and 26" but don't quote me. Folding bikes and shopper bikes have smaller wheels, for example the Brompton has 349mm rims (16")
Why the different sizes? The wheel size tends to go with the design of the bike and its frame.
The small wheels on a folder like a Brompton are necessitated by the bikes design. They don't cope well with particularly rough surfaces but they need to be small for the bike to fold up small.
I don't know anything about Mountain Bikes but I do know they can come in both 29 and 26 inch and people like to argue/discuss about them.
Road bikes are pretty much universally 700c (622mm) although with the advent of disk brakes there are some gravel bikes that can run both 700c and 650b wheels. With rim brakes you were stuck with one wheel size. Also, smaller riders may prefer smaller wheels as a small frame with big wheels can be unweildy. But this can be a problem for small pro riders as they need access to standard spares during races. Emma Pooley (a small but nonetheless very successful pro rider) talked about this.
That's wheel size, which is one aspect of the size of a tyre
Then there's tyre size, which is how fat the it is. Typically the fatter the tyre, the rougher surfaces it can deal with, and the lower the pressure it can take, and fatter tyres tend to be more comfortable. In an ideal world skinny high pressure tyres are faster - and that's what they use on the almost ideal surface of the velodrome. But on the un-ideal surfaces of real roads this isn't true. The question of tyre size, rolling resistance and pressure gets debated endlessly. Frame design comes into it too. Some frames limit the maximum tyre size because they don't have room ("clearance") for fatter tyres.
Tyres with grippy patterns (eg Mountain bike "knobblies") are for when the surface is softer than the tyre itself (eg grass or mud). Where the surface is harder (eg tarmac) slicks are generally used. There are also half-way tyres for use on tarmac that have grip patterns - about which there are often arguments (they provide grip/no they don't they are purely cosmetic).
Then there's the question of tubed versus tubeless, and you have fuel for endless arguments.
Wheel size tends to go with the type of bike. Road bikes tend to standardise on 622mm rims (aka "700c" - don't ask) Mountain bikes tend to have 584mm rims (aka "650B" - no, really, don't ask). I think these are roughly 29" and 26" but don't quote me. Folding bikes and shopper bikes have smaller wheels, for example the Brompton has 349mm rims (16")
Why the different sizes? The wheel size tends to go with the design of the bike and its frame.
The small wheels on a folder like a Brompton are necessitated by the bikes design. They don't cope well with particularly rough surfaces but they need to be small for the bike to fold up small.
I don't know anything about Mountain Bikes but I do know they can come in both 29 and 26 inch and people like to argue/discuss about them.
Road bikes are pretty much universally 700c (622mm) although with the advent of disk brakes there are some gravel bikes that can run both 700c and 650b wheels. With rim brakes you were stuck with one wheel size. Also, smaller riders may prefer smaller wheels as a small frame with big wheels can be unweildy. But this can be a problem for small pro riders as they need access to standard spares during races. Emma Pooley (a small but nonetheless very successful pro rider) talked about this.
That's wheel size, which is one aspect of the size of a tyre
Then there's tyre size, which is how fat the it is. Typically the fatter the tyre, the rougher surfaces it can deal with, and the lower the pressure it can take, and fatter tyres tend to be more comfortable. In an ideal world skinny high pressure tyres are faster - and that's what they use on the almost ideal surface of the velodrome. But on the un-ideal surfaces of real roads this isn't true. The question of tyre size, rolling resistance and pressure gets debated endlessly. Frame design comes into it too. Some frames limit the maximum tyre size because they don't have room ("clearance") for fatter tyres.
Tyres with grippy patterns (eg Mountain bike "knobblies") are for when the surface is softer than the tyre itself (eg grass or mud). Where the surface is harder (eg tarmac) slicks are generally used. There are also half-way tyres for use on tarmac that have grip patterns - about which there are often arguments (they provide grip/no they don't they are purely cosmetic).
Then there's the question of tubed versus tubeless, and you have fuel for endless arguments.
You deserve a prize for that answer @Dogtrousers
I have narrowed down my choice of bike (for now at least) to the Tern Link (20x2" tires) and Node (24x2"). Where I live there is a fair amount of road debris and uneven surfaces and I am looking to ride it for perhaps prolonged distances. So you would say the Node would ride easier than the Link but wouldn't be as nimble and responsiveness to inputs? How much of the disadvantages of a smaller wheel can be offset with an adequately shock absorbing seat post or saddle? Which would be better for mild off-roading? When buying a folder would you follow the rule to "buy the biggest wheels you can get away with carrying folded (on a bus, train, car trunk etc.)"? I know, I know, its all kind of subjective.
My favourite wheel size is the good old fashioned 27 X 1 1/4" aka as fitted on majority of British road bikes between the late 60's and 70's .
When fitted with a pr of decent tyres they just seem to roll along so nicely.
Oh, I have to ask. Do you end up peddling more with smaller tires to go the same distance and speed?
As per the above question my answer would be I don't think so as the gearing is normally tailored to suit the bike design and intended use .
So as long as it's an adult sized bike for road use then my guess would be no .
Someone else will be along to say different soon
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