The crazy two wheel drive arrangement uses a custom hub — with a regular freehub on the drive side and a fixed cog sitting behind the rotor — to drive a chain that is protected by a length of tubing all the way to the front of the bike.
This then drives what we assume is a CV joint, which in turn is connected to another chain on the non-driveside of the front wheel, where a freewheel is fitted.
A chain runs from the rear of the bike to a CV joint…Double
…which in turn drives the front wheelDouble
If you followed that, congrats! For those who can’t wrap their head around that slightly opaque description of how (we think) the Double works, check out this Japanese language user manual, which helps to sort of clear things up.
If you didn’t follow our description of how the Double works, this video should clear things up
If you look closely, you can see that the fixed cog is located behind the discDouble
While a lot of effort has clearly gone in to designing this system — and in all seriousness, despite it’s slightly jarring looks, it actually appears to be pretty slick compared to other 2WD bikes we’ve seen in the past — the promotional videos for the Double have not had the same treatment.
This admittedly quite interesting bike is accompanied by some of the most low-key promotional videos we’ve seen in a while
Jack has been riding and fettling bikes for his whole life. Always in search of the hippest new niche in cycling, Jack is a self-confessed gravel dork and thinks nothing of bivouacking on a beach after work. Also fond of his tandem, Cecil, cup and cone bearings, skids and tan wall tyres.