It’s no slouch in the turns either and although not as calm through the bar as the likes of Whyte’s S-150 on really high-speed, chattery turns, still carves a mean line at pace — I’d certainly be intrigued to try the AM9 with a fork with shorter offset just as Whyte spec. The seat angle is steep at 76 degrees. I must admit that I was a little dubious as to how the long reach and lengthy wheelbase would translate on the trail. Thanks!

If my goal from the bike was to race enduro, perhaps I would have gone for the Large, which some would argue would be the faster, if less playful, bike. Still, its business model means that while you don’t get quite the same back-up support as you would when buying from your local bike shop, you do get a lot of bang for your buck. The steeper seat angle puts your hips nicely over the bottom bracket, so on steep climbs it’s easy to regulate where your body weight is in relation to the wheels.

What does “enduro” mean though? Yes, the Aeris AM9 is an “enduro” bike through and through. Quite simply the fastest bike available for fast, steep and rough enduro courses. A bike that can do anything from trail centres to bike parks and the majority being typical enduro/all mountain riding. My bike essentially started out as the GX build, but I customised it in areas I felt were important without going crazy with the cash. The head angle is a slack 65.5 degrees and the chainstays are relatively long at 440mm, giving a wheelbase of 1,265mm in Large. The standard fork for this build is the Yari. Bird Aeris AM9 GX custom frame review The AM9 offers up 150mm / 5.9in of rear wheel travel, delivered using a four-bar linkage design all controlled via … At 14.3kg the AM9 isn’t super light, but this didn’t hold it back too much on the climbs. The shape of the frame is where Bird really stands out though. The majority of my testing was done in late autumn though, and I’d definitely spec a different set of tyres. And that’s for good reason. That said, in order to get the back end of the AM9 feeling as I wanted, it did mean leaving the rebound adjuster fully open, so lighter riders might struggle getting the feel just right. Most likely found in the woods practicing his scandi-flicks. The Aeris AM9 is its first ever 29er bike, following on from a line of successful 27.5 full-suspension and hardtail models. Basically, it was confident without feeling like I was riding a barge. This means plenty of traction when you most need it, but no shortage of support when you want to work the bike through undulations or load it hard in turns, leaving you to fly out at speed.

A sublime riding, pocket friendly trail and enduro slayer… 4.5/5* – Read the full review. You've been subscribed to our newsletter. The bike is sensitive in its early stroke, taking care of smaller trail chatter easily, yet it ramps up considerably towards the end of the stroke, so I rarely bottomed the bike out regardless of how ham-fisted my riding was. Modern enduro racing is a multi stage race where the riders are timed on the fun parts. The AM9 offers up 150mm / 5.9in of rear wheel travel, delivered using a four-bar linkage design all controlled via a RockShox Super Deluxe RCT, which comes without any volume spacers inside as standard. The reason for Bird introducing a 29er is that it finally felt that the wheel rim and tyre combos are now available to give the roll-over advantages of the bigger wheel, without the strength and weight issues 29ers arguably had. The AM9 rolled on DT Swiss M1700 Spline wheels and a pair of Maxxis tyres; a High Roller II at the front and an Aggressor at the back. It complements and, really, flatters my riding style and technique. Overall, the AM9 offers a seriously well-rounded ride. A size Large bike comes with a reach of 500mm, at the moment it could be argued that 460mm is ‘average’, so there’s no doubting that this is a long bike. It’s very much a case of setting the sag and rebound damping then hitting the trail.

Introduction. While Bird might not be the biggest or boldest brand out there, its bikes certainly stand out. We talk a lot about ‘progressive’ geometry on BikeRadar, basically meaning geometry that extends beyond what might be considered average.

Slack head angle, low bottom bracket and sensational rear suspension. Lofting the front wheel up and over obstacles is easy and the responsive handling makes chucking it around the trail and playing on jumps a smile-enducing fun fest. If you’re in the market for a new enduro bike, long travel trail bike or all-mountain bike, check out our reviews of those we’ve thoroughly tried and tested. It also has a number of permanent demo fleets dotted about the UK. This has a reach of 475mm, though the seat tube stands at just 440mm, so there’s even scope to fit a longer travel dropper post should you wish. Bird AM9 – Review. It goes uphill without fuss and feels incredible on the downs, balancing stability and confidence on faster trails well with its nimble, responsive handling which keeps it fun on every trail I rode. It’s impressively sensitive though well-supported when it matters and tuning the end stroke is a doddle, Cables are routed externally which is a blessing when it comes to working on the AM9, even if it doesn’t look quite as tidy as its internally routed counterparts, SRAM’s 1×12 GX Eagle transmission delivers a massive gear range which is certainly a real plus on big days out in the hills, The Guide RE brakes from SRAM offer loads of easy to control power and felt consistent throughout testing, I had to run the RockShox Super Deluxe RCT shock’s rebound adjuster fully open to get the back end returning as quickly as I wanted, MBUK’s Ed Thomsett drifts one of San Remo’s many loose, dusty turns on the AM9, Best bike: our buyer’s guide to which bicycle type you should buy in 2018, Best mountain bike shoes 2020 | 16 tried and tested recommendations, How maintaining bikes helped me fix my washing machine – and why it matters, 6066 aluminium, with 150mm (5.9in) of travel, RockShox Lyrik RCT3, with 150mm of travel. It’s been bold with its geometry numbers and its malleable direct buying model allows you to chop and change parts to your heart’s (and wallet’s) content. When you just want to rattle over anything in the way, the 150mm of travel just lets you point the bike and let go of the brakes. Quite simply the fastest bike available for fast, steep and rough enduro courses. A word on chainstay lengths; some like it short, some like it long. The bike was built with a RockShox Lyrik RCT3 fork, in 150mm guise, and SRAM’s GX Eagle 12-speed groupset.

While Bird is a direct buy brand, you can still visit both its northern or southern HQs in the UK to talk to the team and check out the bikes in person. This means you can easily control rear wheel traction and front wheel lift — the old maxim that slack and long bikes can’t climb is an urban myth. Chunky welds and gussets give the AM9 a reassuringly solid industrial look. Already have an account with us? At six-foot tall I rode the Medium Long bike, with a reach of 745mm, though I could have fitted easily on the Large — whether I’d have really liked the 500mm reach on the L, I’m not totally sure. BikeRadar would like to thank Brittany Ferries, the Commune of Peille, France, and Kieran Page at La Maison des Activities de Pleine Nature de Peille for their help and support during our Headline Bikes test. The 150mm of rear wheel suspension is controlled by a regular four-bar linkage, with a Metric length shock in there. In its mid-stroke there’s a fair bit of support, which helps that agile, almost poppy feel the bike has. I really liked the 27.5in Aeris 145, so expected good things from the AM9, especially as my preference for bikes is those with larger wheels. I’ll admit to being smitten by this bike, and I wasn’t really expecting to be when I first got on it. Still, the 475mm reach is probably around what I would spec myself, were I building my own frame. And I was far from disappointed.

If I’d been testing the bike in the summer, there’s very little I would have changed about the bike, perhaps a more powerful set of brakes (and/or bigger rotors). While Bird might not be the biggest or boldest brand out there, its bikes certainly stand out. Yet it isn’t so long that I struggled to get the front wheel up in the air. While some of my colleagues love a long bike, I’m not 100 percent sold on super long bikes. Should you be riding tight, nadgery trails, it’s easy to be precise with exactly where you want, or need the bike to go. Our long front ends keep the front wheel planted to the ground on steep climbs while giving you extra breathing room. You can unsubscribe at any time. Sign in to manage your newsletter preferences. While super short chainstays can make a bike feel playful and easy to wheelie, they also shift your weight towards the rear axle, meaning you have to work harder to load up the front wheel during corners. The medium, the smallest frame on offer, sports a longer-than-normal 452mm reach, though this isn’t exactly crazy. A quick word on Bird, if you’re not familiar. And that’s for good reason. Bird certainly falls into this progressive category. Don't miss out on MBUK – get your next 3 issues for just £5, Get the next 3 issues of the UK's number one cycling magazine for just £5, Speed comes easy to this big wheeler and while it feels stable at speed, its lively nature keeps things playful and fun when it matters, Well-balanced suspension that offers plenty of grip yet feels supportive when pushed hard; great geometry that gives confidence at speed without limiting any of the fun factor; customisable to suit your needs and budget, Had to run the rebound adjuster on the shock fully open; spoke tension in the rear wheel loosened off, but this was after many days of seriously hard riding, This is Bird’s first attempt at a long travel 29er and it’s certainly delivered one hell of a bike, We’re big fans of the RockShox Lyrik RCT3 fork. Bird’s first big wheeler isn’t afraid of big speeds. By entering your details, you are agreeing to BikeRadar terms and conditions. April 26, 2018, 10 a.m. on Bike Radar. We like it balanced. Our bikes are long and roomy without feeling stretched out. The Aeris AM9 is the enduro bike you have been waiting for.

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