Following Ritchey and Cannondale’s lead,
Middleburn have developed a double chainring with 29 and 42T rings. The
neat three-arm inner ring also acts as the spider and locks into place
on the back of the splined crankarm with a lock ring. There’s a tiny amount
of lateral flex under maximum big ring power, but shifting between the
‘gap tooth’ rings was dependable and immediate, with a triple shifter
giving more trimming options to stop rubbing across the wide chain line.
Even in deep filth we had no chainsuck problems. The 29/42 on a 11-32
cassette drops you to the point where walking is faster and the wider
ratio between front rings mean a single front change has the same results
as a triple front and rear change.
Upgrade for existing RS7 owners:
one-piece spider and outer ring costs £60,
weight-saver for aggressive XC riders
From Middleburn 01420 23832
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