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http://www.ibiscycles.co.uk/bikes-and-frames-ibis-uk/Hakka-MX
"The Ibis Hakka MX is a gravel bike. It's also a cross bike and a road bike. You can outfit the bike with 27.5 mountain bike wheels, where it'll accept up to a 2.1" tyre. In 700c mode, it'll accommodate very nicely tyres from 23c to over 40c. "I can't see frameset price - anyone? Wait, £2100
https://www.sunsetmtb.co.uk/shop/index.php?product_id=7051&gclid=Cj0KCQiAyszSBRDJARIsAHAqQ4rgwQLvJZh90Qd2oR28YcLEVXJEP3XjuUOtzY6IoN_00NJanEjOs4saAq5dEALw_wcBSimilar idea to the 3T and the OpenUp.
Who knows anything about OpenUp frames? Riding through the shit yesterday it occurred to me that a bike that could go from 25mm to 42mm tyres would be nice and the OpenUp has been raced in TCR by Ultan I think so it has some race pedigree. 3T Exploro is a similar concept. Both are pretty spendy though.