Spec:

- Womens size S 43cm Pinnacle Arkose Frame

- Shimano Tiagra Groupset

- TRP Spyre Mechanical Disc Brakes

- WTB rims and Novatec hubs

Please note due to the size it is collection only, although if you are a long way away, I am happy to deal with a courier if arranged at your expense and risk.

See below review of this excellent ladies road bike from UK magazine Cycling Weekly:

The Pinnacle Arkose R1 is the road-going spec of the Arkose from Evans Cycles’s in-house brand.

Being kitted out for roadie use rather than gravel grinders, the Pinnacle Arkose R1 comes with skinnier 28mm tyres and more high gear range. There’s a women’s version of the Pinnacle Arkose R1 too, with a steeper top tube, tweaked geometry, smaller sizing and a wider saddle.

The Arkose has had a make-over for 2019, with new features to bring it in line with the latest thinking on disc brake gravel bikes. The frame is made of heat treated alloy, with the tubes having quite skinny profiles in comparison with machines like the Scott Speedster. That leads to quite a sparse look – the Pinnacle Arkose R1 could easily pass for a steel framed bike at first glance.

But there’s some nice tapering to the top tube and the down tube, the latter changing its oval profile between the head tube and the bottom bracket shell, to match the stresses at those two junctions.

There’s internal cable routing and lots of mounts: rack/mudguard mounts at the rear and full mudguard mounts on the carbon fork legs. Inherited from its gravel roots, the Pinnacle Arkose R1 also has a third set of bottle bosses under the down tube.

That’s not all it gets from the gravel side though: there’s a stable geometry and loads of clearance. The frame has been designed to take 650b tyres up to 52mm or 45mm 700c, so the 28mm Donnelly road-going tyres fitted to the Pinnacle Arkose R1 look a little lost in all that space.

Pinnacle Arkose R1 spec

The wheels have WTB alloy rims, running on a Novatec rear hub and an unbranded front one. They use thru-axles, a feature now found on the majority of disc brake bikes, which lead to better rigidity and management of braking forces as well as more accurate placement of the brake rotor in the caliper when the wheel is removed and replaced, leading to less chance of rubbing.

Although Donnelly is a less known tyre brand, the Strada LGG 28mm tyres fitted are grippy enough, even when riding on wet roads after a dry spell. They have a rather coarse 60 TPI carcase and a single compound tread (more premium tyres will have 120 TPI and up and multiple compounds for better grip), but the tan sidewalls look really smart. They are not tubeless compatible, although WTB’s rims are.

We really rate the shifting performance of Shimano Tiagra. For a more budget groupset, it’s not dramatically different from 105, except that you lose a gear ratio. Pinnacle’s choice of a compact chainset and 11-32 cassette means that you don’t lose out on range, even if that’s spread over 10 rather than 11 speeds.

The Tiagra series chainset is nice to see, rather than a swap out for a cheaper option. It’s a good looking piece, with the appearance of Shimano’s 11-speed equivalents. There’s an external threaded bottom bracket, which should put up with plenty of use and be easy to replace once worn too.

Wet braking performance was the match of dry stopping power, a benefit you don’t get from rim brakes.

Riding the Pinnacle Arkose R1

You need confident handling in a gravel bike. That’s a characteristic that the Pinnacle Arkose R1 has inherited from its cousins.

Geometry-wise the Pinnacle Arkose R1 comes with quite a long effective top tube for its size. The wheelbase on the size medium bike tested is around 1040mm and the chainstays are 434mm on all sizes. Coupled to a 72 degree head angle, that leads to very stable point and ride handling, that’s good for long rides although not particularly inspiring to more spirited efforts.

Gravel bikes also need to cushion you from bumpy surfaces. In part, that’s down to their wide tyres – with lots of air they can be run at low pressures and will roll over surface imperfections. The Pinnacle Arkose R1’s 28mm tyres do a good job of absorbing road buzz. But the bike’s frame also helps smooth the way, with a compliant ride that deals well with the usual array of potholes and debris.