I think you are meant to use 25mm, but can you get away with 21mm? (as I already have a roll)

Thanks

Yes it’ll be fine

I have rims that have been taped with 21 & 25mm

cheers frankers

assume you are running tubeless?

thanks

I’ve done this before with Crests because I bought the wrong tape. I just trimmed the edges with a Stanley knife, where the rim base meets the wall. It worked.

Using the right sized tape is easier though.

Yes running tubeless

Mattg – I’d have to glue some on, not trim off! But looks as though 21mm will work in an arch so all good

Charlie, Arch Ex and Crest are both 21mm internal width, the 21mm tape is best. http://www.notubes.com/ZTR-Rims-C18.aspx

I was wrong about the trimming, hadn’t looked up the numbers, I’ve used 25mm tape on Crests in the past.