New Frame Day - Bird Aeris 9

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Numnut
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New Frame Day - Bird Aeris 9

Post by Numnut »

Perhaps against my better judgement, I've gone and bought a new frame. This has 160mm of travel and can take up to a 180mm fork. There's a linkage to up travel to 180mm at the rear, but they're hard to come by. It comes with a one up seat post and a set of cura 4 brakes which is pretty good. The seat post is 210 drop, but can be adjusted down to 190, I think it'll be on the limit of what's comfortable for me.

I should be able to move the wheels, drivetrain and controls across from the Aether so will just need a new fork and shock. Typically, Merlin have sold out of reduced fox 36s so I'll have to see what I can find. Probably going to fit a SD Select + shock unless I come across something better.

The plan is to stay at 160 front + rear and have bit of a burlier trail type bike.

All being well it should be here on Friday...

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weeksy
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Re: New Frame Day - Bird Aeris 9

Post by weeksy »

Mmmmm its pretty similar to the Aeris isnt it?
mboy
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Re: New Frame Day - Bird Aeris 9

Post by mboy »

Numnut wrote: Wed Jul 01, 2026 6:20 pm Typically, Merlin have sold out of reduced fox 36s so I'll have to see what I can find. Probably going to fit a SD Select + shock unless I come across something better.
I'll have a brand new 36, same spec as the Merlin ones, uncut steerer etc... for sale in a few days...

Give me a shout if you want it...
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Re: New Frame Day - Bird Aeris 9

Post by Numnut »

weeksy wrote: Wed Jul 01, 2026 6:32 pm Mmmmm its pretty similar to the Aeris isnt it?
Yeah they’re both quite similar, the Aeris is a bit more ‘gravity focussed’ according to bird and the Aether is more trail oriented.

So the Aeris will be better on the downs and hopefully still a bit poppy and not too heavy. Will definitely be overkill for what I’d normally ride, but I wanted to try one and one came for sale!

@mboy yes I could definitely be interested, let me know what you’d like for it.
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Re: New Frame Day - Bird Aeris 9

Post by superstu »

Be interested to see how you get on. I had an early Aeris mk1.5 but didn’t find it pedalled well. Was fun downhill.

This should be nice when built!
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Re: New Frame Day - Bird Aeris 9

Post by mboy »

Numnut wrote: Wed Jul 01, 2026 8:37 pm @mboy yes I could definitely be interested, let me know what you’d like for it.
Drop me a PM...

Also, what shock size does it take...? If it's a 230mm, then I might have a matching Fox X2 to go with it...
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Re: New Frame Day - Bird Aeris 9

Post by Numnut »

superstu wrote: Wed Jul 01, 2026 10:59 pm Be interested to see how you get on. I had an early Aeris mk1.5 but didn’t find it pedalled well. Was fun downhill.

This should be nice when built!
I'm hoping so. I love my Aether 9, but have fancied one of these for a while so the Aether will be finding a new home.

@mboy sent you a message.
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Re: New Frame Day - Bird Aeris 9

Post by Numnut »

Frame was meant to arrive today but parcel force didn’t attempt delivery. Hopefully will arrive tomorrow.

The Aether has been stripped down so parts are ready to move across when it arrives. Forks should be turning up tomorrow too…
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Re: New Frame Day - Bird Aeris 9

Post by Numnut »

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It’s all built up now and looking pretty good. I’ve still got some play in the headset and need to swap brake pads but we’re nearly there.

The dropper is a one up 210 which is a bit too high even when it’s slammed. I’ve got pins to drop it to 190 so I’ll give that a try another day.

Might take it for a run to work tomorrow if I get a chance to sort the last bits out otherwise it’ll be off to twisted at the weekend.
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Re: New Frame Day - Bird Aeris 9

Post by Numnut »

It's done a few trips to work and back as well as a day at Twisted and we're all good!

It's a bigger frame - an ML rather than an M - and sizing is perfect. I was a bit concerned about reach but everything just feels like it's in the right place. It's obviously a longer bike than the Aether and it feels it, but it just glides round corners/berms and still feels agile. It's poppy and easy to jump and whilst it's definitely a slower bike for normal pedalling than the Aether, there's not much in it and I doubt I'll notice in a few weeks. It was easy enough getting round the new red XC line at Twisted which is loads of fun with lots of ups and downs and even a stream or 2. When it gets pointed downwards though, it flies!

I was running the dropper at 210 but found that was too high, so reduced it to 190, which obviously was too low so I've gone for 200mm now and that seems all good.

I've been trying to work out a creak/click since I built it up which only really happened when standing up pedalling when the nds crank was around 6 oclock. Proper click you could feel through the crank. I tried a new bottom bracket, alternative cranks, pedals + chain ring and no difference. I put a new chain on as the one from the Aether was a bit short, no difference. I checked the bearings on the shock linkage and they seem ok, not completely smooth but not dead. Put it all back together with fresh grease and amazingly it's all quiet now. I don't know what was causing it, but it's gone so that'll do.

So all good at the moment... just got the old frame and bits to sell to pay for it!
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