Open UP Shimano Di2 GRXfter Build

The road bike that goes off road!


Recapture your youth

This Open UP GRXfter build is inspired by the Raleigh Grifter - the first blue all-roads bike; as happy doing jumps and riding through puddles in your back alley as it was getting you to school late taking the scenic route through the park.

The Open U.P. has been a sensation at Cyclefit with clients and staff alike. Jules has managed to race Cyclo-X, Road and Mountain Bike, all on one bike by swapping tyres and wheels. The Open U.P. has the performance-oriented road geometry & parts with clearance for mountain bike tires from the original. The New U.P. accepts flat-mount brakes and ships with an OPEN U-turn fork.

Shimano's new GRX Di2 gravel groupset that uses a smaller range on the chainrings (31/48) as opposed to the 34/50 on a standard compact bike and is combined with an 11-34 cassette. The rear mech is available in a long version to manage the wide range of gears. (GRX is also available as a 1 x 11 option and can be used with a 11-45 XT cassette). The levers are now a slightly different shape with a flatter platform and angles levers, they work particularly well with flared gravel bars.

We recommended the 2 x 11 build as this bike is mainly for road use and the odd light off-road foray. The Shimano GRX 1 x 11 option does give a wider range of gears but the jumps between cogs can often make finding a suitable gear on the road quite tricky; this is particularly noticeable when riding in groups and trying to maintain a comfortable speed and cadence. The light weight (7.5kg) and low gearing also means this bike is perfect for any mountainous rides when you get the chance!

The cockpit is our favourite Zipp Service Course alloy handlebar, stem and seatpost. The wheel's are Bontrager Aeolus Pro 3v carbon. 35mm deep with an internal width of 21mm. The owner of this bike didn't want to go too wide with his rims as he is planning to do mostly road riding and will fit 650b wheels when he requires some more tread.

The Raleigh Grifter

Raleigh Grifter

This may not have been Gerard and Andy's inspiration as they didn't live in the UK in the 1970's

IMG 9248

Technical Spec

Frameset Open U.P. - Xlarge
Groupset Shimano GRX Di2 - 48/31 chainset, 11-34 cassette.
Wheelset Bontrager Aeolus Pro 3V
Handlebars Zipp Service Course SL70 XPLR
Handlebar Tape Zipp Service Course CX
Stem Zipp Service Course
Seatpost Zipp Service Course
Saddle San Marco Shortfit Allroads
Tyres Schwalbe G-One Speed Microskin 700 x 30
Pedals Shimano XT
Cages Bontrager Elite
Price (in the region of) £7,000.00

What our clients say

  • "The personal service from both Phil and Julian is second to none. They have such a wealth of experience in fitting that they can almost tell at a glance if something is just a little off. It felt as though it didn't matter how long it took to get the best position possible - even for an amateur cyclist like myself. Can't recommend them enough."



  • "Very very personalised service. You arrive, they expect you, greet you by first name, have checked your file from past visits and set out very clearly what the process will be, what issues they're looking to address and how and they are happy to take the time to walk you through everything in layman's terms. Almost any professional service entity could learn a lot from how Cyclefit works. "

    Peter G.

    Recreational rider

  • "Rode my standard Box Hill loop this morning with the temp shims and more thought to position. Felt more connected and compact on the bike. Fastest ride of the year, picked up close to a km/per hour despite crappy wet pot holed roads, a ton of traffic and a couple of nights out Thu/Fri."

    Matt H

    Seven Evergreen SL

  • "Cyclefit offers an in-depth and highly personalised approach to bike sales. Whatever your riding discipline (for me it’s road, gravel and MTB) the team in Covent Garden will find the right build for you. All this is built around a pro level bike fit and detailed component selection. Add to this the important items often overlooked beyond the bike itself such as shoes, insoles and saddle pressure mapping and it’s a full service operation."


    Self-confessed MAMIL

  • "I tried the shorter cranks today and I like them - it feels like it's less stress for the back and it seems easier to ride higher cadence. In the end I had a good Tour with no back problems. Thanks for your help!"

    Bauke Mollema