Not sure, but are 29er wheels the same as 700c? I have a new cyclocross bike and am looking to upgrade the wheels. The rear hub is 135 qr spacing.
i have always found them to be the same.
Same diameter yes, but check the width of the rims for whatever tyres you want to fit.
Yes. I have a 700c tyre on the rear of my gravel bike and a 29" one on the front on the same 700c rims/wheels. My 29" HT wheels are also interchangeable with the 700c ones on the gravel bike. As above, check widths and make sure hubs are the same and should be OK
There might be a technicality difference, but essentially they are the same.
My FatNotFat 29er wheels are ~20mm internal rim width, a set of 700x28 tyres are a very safe minimum option to fit, up to a maximum of 29x2.35" (where I would need to not run pressures too low because of tyre shape and to keep the bead seated).
My road bike's wheels are 17mm internal rim width, 700x23 tyres are a safe minimum, with ~700x50 being a safe maximum (not that my bike has clearance for more than ~32mm wide tyres).
Yes, they are exactly the same. I presume inches are used because MTB came from US so we had 26 inch and then 29 inch and then 27.5 inch.
I have been using MTB rims on road (fixed track) bikes for years as disc rims are all black and don't have a braking surface (as I don't need one). Currently using Mavic XC621 as they are cheap and light which have had 700 X 25, and 700 x 43 tyres on but would happily run a 29er MTB tyre.
Check the maximum pressures, not usually a huge amount in it (certainly for bigger CX tyres) but XC 29er rims will be lower than a road rim.
I think Gary Fisher coined the term "29er" and "29 inch" to market his big-wheeled mountain bikes. Which used 700c (622mm bsd) rims so no new rim standard was actually needed, just fatter tyres. Basically re-badged cyclocross rims. Including the tyre the diameter was about 28.5 inches. The first 29" tyres were not very tall (allegedly so they could be made in existing tyre making tooling) and didn't come in sizes much above 2.1" if I recall.
Just like 27.5" and 650b (584mm bsd) - same rim diameter. (27.5 came after 29.)
I guess this all flows from the original mountain bike nomenclature coming from the US where they re-purposed wheels and tyres called 26" and they like imperial units anyway. It makes some kind of sense for subsequent mountain bike wheel sizes to use the same naming method.
Road, cross and gravel (despite the latter being a bit of a USAian invention I think) use metric. Probably because gravel was invented by roadies. Seems particularly confusing in the case of gravel bikes, where tyres are getting up to mountain bike widths.