Rattlebone Design History

Brief Development History.  

The original sidehack prototype was a small passenger carrying bike fitted to a scrap bicycle. This was developed and designed to be used to carry young passengers; an alternative to the trailers and tag along options often seen. It was fabricated from electrical conduit and brazed into a frame assembly. The sidecar wheel was cantilevered from the outside and mesh was added to protect the rider.  

Original Prototype Hack

Original Prototype Hack

 

This vehicle developed a high level of interest but was not straight forward to ride and its width made it awkward in certain situations.  

But when it was tested on a BMX track it proved immensely popular and great fun to ride.  

To take the idea further, the next build was the Rattlebone MKI. This was an improvement on the prototype, being seam welded throughout and made from professionally formed steel tube. The design had been drawn on the 3D CAD system and it had significantly simplified parts from the prototype and a different system to mount to the bike frame.  

MKI Rattlebone

MKI Rattlebone

 

 However there were some problems. The design was overly wide and only just long enough to accommodate the riders left knee when pedaling.  It was also heavy. On the positives, the design did prove to be robust and significant stress tests gave no problem at all.   

The MKII looked essentially the same as the MKI but was in fact narrower and longer. It still featured the full wheel guard and had the same geometry regarding the position of the two riders. Performance was much better thanks to the narrower track, but part count and costs were now the major obstacle to going into production. The front mount to the frame was also clumsy and bulky.  

The MKIII was a more radical rethink. The same proven geometry was maintained but the tube part count was reduced thanks to a completely new wheel brace assembly.  The number of formed tube parts was also reduced from five to just three. The fender was shortened to lighten the hack and the sidehack handle was angled forward to give a more dynamic riding position. A completely new front mount was designed that used a single bolt attachment system and a high density vinyl lining to protect the bike frame. Attaching and removing the hack from the bike was now a 2 minute operation involving one nut and one bolt.  

Finishing touches included laser cut text in the tread plate and wheel brace, handle bar tape and a 48 spoke hack wheel.  

First MKIII Production Hack

First MKIII Production Hack

 

MKIII Rattlebones are now available to order.

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