Potential gravel bike?

[si_c]

If it's light gravel of the sort you get on canal tow paths, you should be fine with 25c, I've happily ridden narrower on worse. Just be careful of muddy patches and you'll be fine.

 

[Dogtrousers]

Problem is the bike is in France right now so unsure of clearance. I believe some have used a smaller wheel to get around that? It`s more about the potential with the gears, frame, bars etc.

The bike has rim brakes. Fitting a smaller wheel could be a dead end.

That said my bike is a "gravel bike", insofar as I ride it on some rough gravelly stuff occasionally (28mm slicks so not too rough, but it's surprisingly capable and it's fine on unsurfaced roads and paths as long as there's no grass/mud where I lose traction) I think the best approach would be to just go for the fattest tyres you can fit.

The linked bike is supplied with 23mm tyres. The bike in this review https://www.bikeradar.com/reviews/bikes/road-bikes/calibre-rivelin-review/ has 25s. You might get 28s on at a pinch. You might not.

 

[figbat]

If anybody comes here after the fact just a quick comment about brakes - gravel bikes can be made with canti- or V-brakes as well as discs. But caliper brakes are out, for the reasons described.

 

[matticus]

If anybody comes here after the fact just a quick comment about brakes - gravel bikes can be made with canti- or V-brakes as well as discs. But caliper brakes are out, for the reasons described.

Good point.
(although you can often go pretty big with calipers ... I have an early Spec. Roubaix and tried it with 32mm (and no guards). They fit, but couldn't go much bigger. That's a very good compromise size for a bike that will also see a lot of tarmac. As someone else said, chain stays are often the limiting factor - but not on my Roubaix.)

Also you upset the purists in Grav Groups if you deviate from disc brakes, single chain rings and frame bags ;-)