The Bartol system is a patented invention by the Bartolozzi brothers who have this system manufacturered exclusively by the TISO Bicycle Company in Italy. The wonder of this system is, that it makes the front derailleur completely unnecessary. For prices etc. go to Tiso's website. At the moment they only make a 53 as their largest chainwheel size, but this can change in the near future. Please email us to be kept up to date on the current status of the 56 tooth size.
When you're on the small chainring, you can use all your sprockets down
to the second smallest. When you're on that, the chain is again misaligned in the other direction. On the large chainring are four recessed Allen screws which act as hooks, which lift the chain and feed it over the large chainring, which also has some specially ground teeth to help the chain up.
From there you can use all your gears including the third largest sprocket.
Like I said, this isn't a high-tech description using long-winded words or hype. And Tiso isn't paying us to support their product - they don't need to. The Bartolozzi brothers should get the Nobel Prize for technology or something.
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