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Tyre sizing - standard v tubeless GP5000.

Was due to go for a big ride this morning, but instead I'm refreshing the tracking details on my new wheels that are due mid ride window and everyone else is out! Conflicted, but excited.

Short version - are tubed and tubeless Contis likely to blow up to the same size?

Bike has 17mm internal rims now, with 25mm GP4000 that measure 26.5 and 'some' clearance. Running DA9000 cantis which are rated at 25mm max.

New rims are 27.5 external, 19mm internal - lighter, wider, aero, tubeless. Ideally I'd like to run 28s on them, tubeless.

I have access to 28mm GP5000, non tubeless to try as well as my 4000 25s. These 28s measure bang on 28 on a 15mm rim.

Plan is to fit tubes and various tyres, check clearances then buy some tubeless tyres in the larger one I'm confident will fit.

I have read 5000s are a bit smaller than 4000s but any variation between tubed and tubeless versions?

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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