First spotted on the Open AXX1 at Sea Otter, THM’s new Clavicula M3 modular crank is now available through Fairwheel Bikes. The original Clavicula is a popular option among the lightweight crowd, but the introduction of the M3 opens the crank up to all of the modern drive trains. As a big improvement from our standpoint at least, the spindle has been redesigned and is now made from aluminum rather than carbon. The carbon spindle was plenty strong and stiff, but as we experienced – the need to place the crankset in the freezer before installing, and the difficulty of uninstalling the carbon spindle version was a little troublesome. The new alloy spindle should prove more durable, and quite a bit easier to install.
Chainring configuration, BB standard? Take your pick after the break.
Thanks to the new lockring around the 30mm spindle, chainring options are nearly unlimited.
Current spider options include doubles in 104/64 and 120/80 BCD, Single XX1 specific, and triple 104/64 BCD, and we wouldn’t be surprised to see one piece spiderless rings popping up in the future. Keeping the 8 spline interface and pinch bolt non-drive drank arm of the original Clavicula, the biggest change is obviously the alloy spindle. While the spindle is 30mm, bottom brackets are available in almost every standard including BSA (standard threaded), BB30, PF30, BBRight, Pressfit, and BB386 Evo. Likely due to the new spindle, rider weight limit has been raised slightly to 243lbs, up from 230. Fairwheel notes that there is a lifespan specified by the manufacturer of 10 years or 62,000 miles, at which point it should be sent back in to THM for inspection.
|Crank Arms Only||344 grams|
|Double 104/64 Spider||39 grams|
|Double 120/80||48 grams|
|Single XX1||42 grams|
|Triple 104/64||42 grams|
|English BB Cups||73 grams|