FSA, with the K-Force Light MegaExo, are now bringing this concept to MTBs. Based on the K-Force Light cranks with hollow i-beam monocoque carbon arms, they should be light – a claimed 720g including a ceramic bottom bracket. The 44/29 should provide a wide spread of ratios with only the loss of the very lowest gears.
No price yet, but the road versions cost a weighty £459.99, so don’t expect the MTB version to be too much cheaper. Head over to www.fullspeedahead.com for more info.