Spotted: Bernard Kerr’s Prototype Carbon Lugged Pivot with Two Chains

prototype pivot dh bike carbon lugged dw6 linkage two chains

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Possibly the most fabulous bike we’ve seen at the Lenzerheide pits this week is that piloted by Bernard Kerr. Pivot Factory Racing is developing a new Phoenix Downhill Bike using a lugged carbon frame design to aid in rapid prototyping.

pivot dh bike prototype lenzerheide lugged carbon frame

Sadly, the production frame will materialize in a more traditional carbon frame format and, realistically, no paint job is going to match how bling this thing is.

pivot dh bike prototype upper rocker link carbon lugged frame

Moving on to arguably more important aspects… Bernard’s ride sees an all-new Dave Weagle linkage design that leaves the twin-link configuration found on the Phoenix production well behind.

The prototype gets a familiar-looking top rocker that drives the shock but, lower down, things are far more intricate.

pivot dh prototype two chain lower linkage bernard kerr's bike lenzerheide 2023

From what we can see, two links connect the chainstay to the front triangle in a layout reminiscent of the DW6 platform. The chainstay’s lug actually has two pivots, one connecting to the higher link that pivots about the seat stay, and another that connects to an even shorter link that again, pivots about the seat stay.

Looks like the prototype allows the team to run two different progression settings thanks to a flip-chip at the lower shock mount

I can’t quite do the mental gymnastics necessary to see exactly how these links will articulate, but it’s clear from the high main pivot location that this bike will deliver a rearward axle path.

I did hear a rumor that this pulley arrangement had a free-coaster to allow the rider to change gear without pedaling, but I can confirm this is untrue

As with any high-pivot design, this one needs an idler pulley to route the chain in a kinematic-friendly manner. Clearly, Pivot has taken a less conventional approach to this with a Jackshaft style twin-chain solution, wherein both chains are on the same side.

The chainring drives a very short chain, that in turn drives a pulley wheel that is pivotally connected to a secondary chainring that drives the main chain… which drives the 10 speed cassette. The drivetrain solution, also patented by Dave Weagle, was previously covered in detail by PinkBike’s Seb Stott.

Ultimately, this drivetrain layout allows the team to spec a much smaller chainring than usual (26T or 28T, maybe) to give the bike more ground clearance. It also has next-level chain wrap everywhere, reducing the chances of a dropped chain to nigh-on zero.

bernard kerr runs 10 speed shimano saint group on prototype pivot sh bike lenzerheide 2023

We have reached out to Pivot for more information. In the meantime, all the best to Bernard Kerr, Jenna Hastings and the rest of the Pivot Factory Race Team!

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