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Oregon-based framebuilder on his single-sided creations

Rob English has been consistently making some of the finest steel road bikes over the years. We’ve highlighted a fair few of them, including his NAHBS winners, as they have always been bikes that have stood out for some reason or another. Whether it was the 5.8kg superbike or the Naked time trial bike, they’ve always turned heads. His Project Right bikes are something else, though, because half the frame and fork is missing!

English Cycles 5.8kg carbon and steel superbike

The idea for producing a single-side frame and fork came about in 2012 at the request of a customer who asked Rob to produce something a little bit different. And different the bike certainly is. We can't think of many bikes that only have half a fork and no seatstays to chainstays on the non-drive side. Well, apart from the famous Lotus 108.

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To make it possible, Rob first modelled the frame using 3D CAD computer software to ensure it was possible to build a frame with several key parts of it missing. He tells us that the high stiffness of steel means that increasing the tube diameters actually made it fairly straightforward to produce a single-sided bike, but he still had to make some changes compared to a regular frame to make it all work. 

He built the frame and fork using oversized tubing sleeved at the base to add extra stiffness and strength, with a triangular profile for the chainstay where it meets the bottom bracket, providing additional stiffness. Because the chainstay sits between the drivetrain and rear wheel, Rob tells us “the drive has hardly any leverage to exert lateral forces onto the axle.”

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- Rob English’s single-sided Project Right bike

The rear hub is a custom design with a one-piece axle and shell. “The bearings are press-fitted into the tube at the end of the chainstay – the axle slides through this, then the freewheel carrier is  splined onto the end of the axle with a cap bolts in place to hold everything together,” explains Rob. The bike pictured is a singlespeed with a belt drive, and the design allows easy belt installation. 

Compared to the lengths he went to in developing the frame, he says the fork was much easier. One-sided forks are nothing new, Cannondale has been pushing its Lefty, both suspension and rigid, forks for many years now. Rob has used a Lefty-style aluminium axle which press fits straight into a socket at the base of the leg and the fork crown clamps onto a one-piece stem and steerer tube. 

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You can see more details on that original bike right here.

Any concerns that the bike will be all floppy and flexy are quickly dispelled by Rob. “I haven't actually measured any deflection to give you stiffness data; I can just report that there is no flex when riding,” he tells us. 

He adds: “stub axles are very common on vehicles - when was the last time you saw a car with the hub supported on both sides? I think we are just not used to seeing them on bicycles, although it has been done before, notably, on many of Mike Burrows designs (from the original Lotus to the Giant Halfway).

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We also asked Rob if there are any weight savings with this unique design. “No real weight saving,” he says. “With further refinement, this might be possible, but the oversize single tube ends up weighing about the same as a regular pair of tubes.

“Honestly there is not a compelling reason to build a bike this way (apart from fixing punctures without removing the wheels), but for the rider who wants something completely eye-catching and unique, it is an option. For me, it was a nice challenge to tackle both as a design and fabrication project”

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Yet it appears to have become popular. Rob has built a few since that original bike four years ago. There was even a 29er mountain bike version which was displayed at NAHBS and looks absolutely stunning. And he's since built two more road bikes, the latest has been painted to match the Paul Smith Land Rover Defender. The one-off Defender was created by Sir Paul Smith to celebrate its heritage, and features 27 different colours across the various body panels. There's a good video with Sir Paul Smith talking about the reasons for the creative direction of the special Land Rover here. 

Rob will be over for the Bespoked show next April, and hopefully, he'll bring a few bikes with him. You can see more of Rob's work at www.englishcycles.com

David has worked on the road.cc tech team since July 2012. Previously he was editor of Bikemagic.com and before that staff writer at RCUK. He's a seasoned cyclist of all disciplines, from road to mountain biking, touring to cyclo-cross, he only wishes he had time to ride them all. He's mildly competitive, though he'll never admit it, and is a frequent road racer but is too lazy to do really well. He currently resides in the Cotswolds.