John Tolhurst's blog

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Vendetta first prototype build
Submitted by John Tolhurst on Fri, 25/09/2009 - 8:38
We completed a first build on the Vendetta prototype this week. Currently running a Silvio front end, this bike will allow us to evaluate a range of ergonomic and fitment questions. There is a second rear brake position behind the top of the seat, that will take the calliper out of the airflow.
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Vendetta is shaping up
Submitted by John Tolhurst on Tue, 01/09/2009 - 7:29
To John and co on the forum thread Aero Time Trial Helmet, thanks for your ever thoughtful responses. As we want the record to be for a production bike, we need to work with what we have on that score, this means aeroising (is that a word?) the carboyoke is out, narrowing and lowering the handleb
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Starting at the back
Submitted by John Tolhurst on Mon, 27/07/2009 - 22:08
We are working on a TT bike, I made the odd post on that already in our forum. When I designed the Silvio I restrained myself to the rear half and got it done ok in a few months, I used a sofrider front end. This time I'll do the same thing on the rear for the new TT bike and just hook it up
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WORLD Cruzbike 12-hour recumbent record holder
Submitted by John Tolhurst on Thu, 16/07/2009 - 23:36
Saratoga County, New York, Saturday 11th July, 2009. After stopping a little before the 12-hour mark with 211 miles, Maria Parker riding a Cruzbike Silvio not only set the recumbent 12-hour course record for women, but went farther than any previous female road biker had ever done in the annual Sara
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Adjusting Elliptical or Ovoid Chainwheels
Submitted by John Tolhurst on Tue, 14/07/2009 - 20:30
Early Origins Elliptical chainwheels or elliptical chainrings, or ovoid rings or whatever you like to call them have been in and out of vogue every decade or so for more than a 100 years. [1,2] They come into vogue because of the logic of taking advantage of the extra leverage the crank has half
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