I've had 32mm Hyper on there and they're ok but there's not a great deal more room. It will depend on how the tyre casing inflates. I've got some 35mm Hypers I could test fit. Actually, perhaps they would be ok for TCR?
Are the Hypers still sold somewhere? I'm riding a pair of 35's now, but haven't seen them in shops anymore. The foldable version with many tpi.
.. Oh, just checked, planet x has them in stock again, but only brown. Why is a tyre even made in brown.
Along with bikes, I stockpile tyres at home :)
Brown for shitty city bikes.
@Samuli started
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I've had 32mm Hyper on there and they're ok but there's not a great deal more room. It will depend on how the tyre casing inflates. I've got some 35mm Hypers I could test fit. Actually, perhaps they would be ok for TCR?