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Tue 3 Nov, 12:30 pm UTC

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Santos concept bike geared for roadies

By Jeff Jones

Dutch company Santos unveiled a concept bike at the BikeMotion show in Utrecht, Holland last weekend.

The SRR05 is an aluminium framed road bike with a belt drive and a Rohloff internally geared hub – similar to the one used by James Bowthorpe in his round-the-world record-breaking ride.

Unlike Bowthorpe's strictly-for-touring Travelmaster, the SRR05 is geared towards speed rather than load bearing.

Santos's Robbert Rutgrink told BikeRadar that the SRR05 was a result of interest being expressed in a bike for "winter training, fast commuting, the odd sportive, light credit card touring and a general all-round bike for people with limited storage space at home".

The belt drive and rohloff hub: the belt drive and rohloff hub

The belt drive and Rohloff hub

A grip shift to change gears: a grip shift to change gears

A handlebar mounted grip-shifter is used to change gears

The aluminium frame is coupled with a carbon front fork to create a not-too-aggressive geometry. Santos have made it easier to change the belt by including a removable section near the dropout, as opposed to the cutout in the seatstay found on Bowthorpe's bike.

Changing gears is done via a grip-shifter on the end of one of the handlebar drops. The frame is eyeleted for front and rear mudguards, and will take a lightweight Santos rear rack (made by Tubus) with a capacity of 10kg.

The bike as pictured weighs 9.9kg (21.8lb), which makes it one of the lightest ever Rohloff hub equipped bikes.

Rutgrink said the SRR05 was well received at the BikeMotion show, adding: "The versatility of being able to add a rear rack and mudguards is finding a lot of favour as well as the low maintenance appeal with the Rohloff and belt."

But he stressed that it was still a concept machine. Whether the SRR05 will make it into full production remains to be seen.

You can follow BikeRadar on Twitter at twitter.com/bikeradar.

User Comments

There are 12 comments on this post

Showing 1 - 12 of 12 comments

  • Looks promising except for the twist grip shifter on the bar end.

  • Two things need to be done to make the Rohloff friendly to road bikes.

    First, they need to make a shifter that is designed for road bikes - a bar-end and/or down-tube shifter would probably be best.

    Second, make the gearing spacing a bit closer. The current 14 gears are separated by 13.6% increments, leading to a 526% total gear range. This allows it to match the increments and range on a standard mountain bike 3x9 setup pretty well. Unfortunately, it is not ideal for road riding where tighter gearing would be better in exchange for giving up some of the range. A decent compromise would be to use 11% gear increments and a 388% gear range.

    I would never consider spending that kind of money (the hub costs close to 1000 UKP) on a drivetrain that is so poorly designed for road riding.

  • I'd prefer a belt drive single speed for winter commute duties. Theres a few hybrid-ey type bikes about with the Nexus or Alfine that are cheaper, though not really geared for proper roadie use

  • No belt drive but the hub geared road bike has been done before and done better:

    http://www.dynamicbicycles.com/buy/Bikes.php?prodid=75

    Note the STI style shifter - much more elegant.

    Matthew

  • Or the Sheldon Brown route - a 7 speed cassette on a three speed hub with three chain rings - 63 speeds !

  • mmmmmmm..........marmite!

    You either love it or hate it i guess.

    I love Marmite but i hate the ideal of a rohloff on a racing bike!

  • That has to be the worst engineered, ugliest shifer I've ever seen. What, exactly, were they smoking? I thought the days of removing your hands from the bars to shift gears were dead and gone.

    Also - if this is aimed at the "bad weather training bike" market, where are the disc brake tabs?

  • As others have commented, someone really needs to create an STI style shifter for the Rohloff before it's going to do well in the road-bike niche. Of course, said shifter might prove complicated with having to pull two wires?

    Maybe the solution is to stick a small electric motor where the clickbox would be and use something like the DA2 electronic shifters? (Bonus points if you can manage to power the battery/capacitor off of a hub dynamo!)

  • A very interesting concept indeed. My suggestion: cantilever bosses and larger clearances for use towpaths and light singletrack and the odd bit of cyclocross. The dropout and gear hanger looks interesting. Could it be used as a singlespeed perhaps also?

  • or a helper monkey to perch on a rear rack and whack the gear changer with a mallet when you want to shift.

  • Hell, I'm loving the idea of belt drive single speed set up. If only you could lose the Rolhoff, this bike'll be half price.

  • Oh, and I'd be wanting some Campag brake levers too. Why?

    a. I love the feel of Campag

    b. I love to start meaningless arguments which will never end.

  • 1

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