The de­tail

Cyclist - - Open | Bikes -

The Open Up­per is built around com­pat­i­bil­ity for both 700c and 650b wheel sizes. Such a change can ar­guably be done with any disc brake en­durance bike, but the key dif­fer­ence here is in the clear­ance for the 650b tyre – where the stays and fork are adapted to fit a 2.1in moun­tain bike tyre. For a 700c road wheel, or a 29er moun­tain bike wheel, the Open can fit a 40mm tyre (left) eas­ily, giv­ing more clear­ance than on most cross and gravel bikes. For those keen on wide tyres, Vroomen says the 650b op­tion matches the han­dling char­ac­ter­is­tics per­fectly to a road set-up. A 650b wheel with 2.1in (53mm) tyres comes out with a ra­dius of 342mm, only 1mm more than a road wheel and 28mm tyre. Main­tain­ing this size of wheel and tyre is im­por­tant to en­sure the qual­ity of the bike’s han­dling, ac­cord­ing to Vroomen.

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