The Diamondback Lumis is an entry level cross-country / trail bike. Price-wise it sits well in the market at £1,500, offering good value for the components you get and a great look.

The Lumis Frame 

Its lightweight construction is based around the carbon frame with 12x142mm bolt-through rear axel (and bolt-through front forks), delivering an attractive and robust foundation. The black and blue finish is sleek and stealthy and this particular colour way gives the bike a moody appearance.

The Advanced Compact Carbon Frame, constructed using proprietary high modulus carbon fibre layers, is light and looks slick. The frame is good and stiff with attractive indented curved rear stays and tapered top tube. The frame has certainly been designed with UK weather in mind, as the clearance between the stays and around the bottom bracket is excellent, and proved perfect for a long slogs through the mud!



The Rockshox Reba forks offer 100mm of reliable travel. I have ridden plenty of these in my time and they never fail to deliver. The latest version on the Lumis has a lock-out lever on the handlebars and a level of adjustment and sophistication that you will only have seen previously on top-end suspension forks. They also look mean with black lowers and stanchions, again adding to that very stealthy look.


The SRAM X9 2×10 gearing combined with the Diamondback 4 arm chainset creates smooth, precise and efficient gear shifting, and the chainset arms have been hollowed out helping to reduce weight. The surprise package is the TRP brakes, which are made by Tekro. The single piece calliper saves more weight and has an angle adjuster for clean frame alignment, with the brakes using old Shimano XT style pads so finding spares is easy. There’s a really good positive feel at the lever for traction control and felt powerful after bedding in.


The cockpit components are all very neat featuring the matt black Easton EA70 bars, stem and seatpost, offering good and precise control. Again these sit well with the black spec, especially with their minimal graphics, and it’s great to see a well-known brand finishing off a bike of this value.

The only real niggle was the rear hanger; the metal was very soft, which means the rear-derailleur can easily be knocked out of place and create problems with gear shifting. This is a minor thing that can usually be resolved by bending the rear hanger back into place, but it’s not ideal if you’re not a used to fixing your bike. That being said, for around £10, you could replace it for a stronger one and not have to worry about it.


I really enjoyed the feel of this wheelset on my local trails, they are a good fit with the spec and tick most boxes. They don’t have brass nipples for strength, but that is only minor quibble. They will more than meet the demands of most trails, but they’re not designed for big lads who take big jumps! The Alex Volar rims can be run tubeless which is a bonus. The blue anodized hubs are a slick touch, picking up the blue flashes on the frame. The tyre choice is very XC with Schwalbe’s Rocket Rons, but these are quick with low rolling resistance and still have great grip in loose and wet mud; the perfect all-rounder for pretty much any condition, and my XC tyre of choice.


The Verdict

The geometry is very upright delivering a conservative and rather formal ride. This makes it less racey and aggressive, and more suited to the mountain biker who enjoys the views over the red mist of chasing down your friends. It would also be the ideal off-road commuter, or for a rider who needs one bike to deliver both comfort on the road and fun in the woods.

The matt black and tapered tubes deliver a stealthy yet practical image, and the moody blues and blacks look tidy. It has a really good quality finish, the components are excellent for the money and well considered, and the whole package is generally very practical. In fact, it turned out to be pretty Roo-proof!

Diamondback are really making a come-back into the world of mountain biking and we are seeing some incredible viral videos of people doing incredible stuff on them, proving their abilities. The Lumis is a real head turner, has real appeal, a great price tag, and would suit a novice cross-country rider or a conservative trail hacker.

My advice is to commit to that trail with blind fury and let the Lumis pay you back with smiles for miles. You may need to buy some new slick cycling kit to look as good as the bike, but it’s sure to make you feel good as well as look good, pack you with some well earned confidence, smother you in fresh enjoyment, and leave you wanting more trails. Who wouldn’t want that?!

Verdict: 4/5*

The Diamondback Lumis 3.0 retails at £1,500, with lower spec and prices available.