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After playing around with full fat and a 29+ front wheel on my Gryphon I was pretty sold on the 29+ format. I had a ride on a Krampus and went through a few iterations of drawings. I'd formed some pretty clear ideas about what I thought would work in a full 29+ format and it was time to turn them in to metal. So the order went in for a few protos from my friends in Taiwan and the frames and forks turned up yesterday. Sadly I'm not expecting my order of Dually rims to come in until next week so for the moment we are running on a P35 front and Flow rear. Set up SS for the mean time but will also be trying it with gears soon (it has a replaceable derailleur hanger not pictured here) - it looks like a full 3x10 drivetrain should work.
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Tapered external cup headtube and tapered steerer - this is the same as is on the Puffin full fat frames as well.
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Tyre clearance shot and also put a front derailleur on with direct mount adapter - loads of room! A triple should even be possible. Obviously a wider rim will push things out a bit but I think there will still be lots of space.
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Bolt on cable guides, there is a triple version for geared use as well. Again, these are the same for the Puffins as well as the new Swifts and Gryphons.
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And the whole thing, it's a bit of a hodge podge of bits but that's how it tends to go with my protos - just grab what's in the shed!
The critical numbers are 445mm chainstays, 70mm bb drop, (both +/- 6mm thanks to the eccentric), 70deg HA and 55mm fork rake. Other dimensions are broadly similar to the Swift, final sizing TBD.
This will probably be my next Kickstarter project, stay tuned for more details. Any and all feedback gratefully received.
Looks very nice!
Love this. Another thread here too... http://singletrackworld.com/forum/topic/singular-rooster
Will you be offering it as frame/fork/wheelset? At least for the kickstarter maybe?!
Looks great, any idea on ETA to market?
How do you plan to sell it? just frame & fork?
Edit - wot ska said.
I hope they'll be enough interest in a small. I've got it into my head I need a rigid 29er to replace mt rigid 26er and it needs to be able to run a Rohloff without a tensioner. El Mariachi looks favourite at the moment but if there's an alternative that'll take a wider tyre so much the better. I see there is some interest in a small version of the fat bike so hopefully they'll be some demand for a small version of this.
Nice
What tyres do you have?
That looks bloody brilliant.
Looks great. Very interested Sam. But:
Need to see the rear clearance with a Rabbit hole rim (weakness of the Krampus no? Have a look at the Travers thread on UK fatbike forum)
And the colour is the first one you have done that just does not work for me
Fix them, Gis a go, and I'm really interested. 😀
Whilst I appreciate it may be a little compromise or a compromise too far but could rear tyre clearance be maximised with a 100mm BB like on the Puffin?
I'm in if this goes to a Kickstarter .... Love the yellow too 8)
I don't like fat bikes. There, i said it. I don't know why, i just can't get my head round them.
However, this....... is nice. And i do like the colour.
avdave2 - you really need to think about the implications of that size tyre for a smaller rider. I like the 29+ concept as I think that would work for most of my riding but lack of space betwixt saddle and tyre, or bars and tyre, rule it out as a bikepacking steed for me.
That is lovely... Though... I love the colour but it doesn't strike me as very [i]Singulary[/i]. Something about the blue Swift that made me fall in love straight away.
I was pretty sold on the 29+ format
Sam, what do you like about 29+?
The prototypes literally arrived yesterday. It is a little premature for many details. However.... My intention would be to offer 3 sizes, frame and fork, with possible options for wheelbuilds. However wheels are less difficult than for fatbikes as they use standard 100/135 spacing.
My philosophy on sizing has always been 'as long as it handles nicely'. This is possible to achieve in a small size with the fat bike thanks to the short fork and chainstays - it's not so easy with a 29+ wheel.
Sam, what do you like about 29+?
+1
Looks bloody lovely.
Yum!
There I was looking for a 'different' SS project (as opposed to SS-ing my Swift) and lo!
It gives a lot of the traction and 'unstoppable' feeling of full fat but without so much of a weight penalty and seems to roll much better.
Plus it uses standard width hubs and BB so you can throw some regular width tyres on there if you like and have acres of mud clearance.
I agree with [u]theotherjonv[/u] : I not a fat-bike fan but that looks sweet 🙂
In the interests of balance, ignore these naysayers...
Keep it yellow!
looks great Sam..
awaits progress and updates with interest.
This looks superb Sam, will be watching with interest.
My main gripe with the Krampus was chain/tyre contact with a double and even single ring which eats away at the delicate knard sidewalls over time. 100mm bb would solve this and make a double properly useable.
Yes, isnt it chainline the issue, rather than clearance per se?
Looks great, but yellow 🙁
Got the 29+ Surly wheels sitting, whens the kickstarter er kickstarting! 🙂
That's very pretty.
How are the tyres on normal width flow rims? Roll?
GB
That would look awesome in blue (to go with my other blue bikes!)
Is this going to be called the 'Canary' then?
Sam - what happened to the new ti 29er? Shelved for now?
If it's staying yellow it needs to be called Canary
Hmm. Very tempting. I've had a spin on a krampus, and it was nice. This might actually tempt me to sell my swift.
Like the look of that, nice one.
That's sweet as a banana with lemon, definitely my kind of a dessert 😉
Would it handle bike park Wales, and what tyres for the surrey hills?
Looks great Sam. keep it yellow 🙂
Would it handle bike park Wales,
Of course, that's down to the rider not the bike.
and what tyres for the surrey hills?
I believe the choice is Knard, Knard or Knard.
My main gripe with the Krampus was chain/tyre contact with a double and even single ring which eats away at the delicate knard sidewalls over time. 100mm bb would solve this and make a double properly useable.
More testing required to see how this works out. Was this an issue in all conditions or only with thick mud built up on the tyres?
good yellow!
Love the yellow. A couple of my early mtb's were yellow (GT Tequesta and GT Zaskar) so yellow's got some nostalgia for me.
Hi,
Why no proper semi-fat rims on this gorgeous beautie?
Slightly concerned about rear clearance as soon as you go properly with rim e.g. Rabbit Hole, Dually, Kris Holm or Nimbus...
Checked my Knard on R.H. and it is 75mm wide. Is it going to fit stays, or by design it is not constructed for anything wider than Flow?
Cheers!
I.
Ivan
Sadly I'm not expecting my order of Dually rims to come in until next week so for the moment we are running on a P35 front and Flow rear
According to [url= http://surlybikes.com/blog/post/your_rabbit_hole_looks_knardy ]SURLY[/url]...(info on tyre widths).
The Knard 3.0 tire on a Rabbit Hole 50mm rim will be 75.8mm/77.7mm (casing/tread) wide and will have a diameter or 779.4mm (at 19psi).The Knard 3.0 tire on a Velocity P35 will be 72.6mm/76.7mm wide and have a diameter of 778.6mm.
A Schwalbe Racing Ralph 2.4" tire will be 66.0mm/59.2mm wide and have a diameter of 752.2mm when mounted on a Rabbit Hole rim (at 35psi).
A Continental Trail King 2.4" tire will be 65.5mm/57.1mm wide and have a diameter of 759.5mm when mounted on a Rabbit Hole rim (at 35psi).
Cant get over the price of those Rabbit Hole rims...£140ea !!!
The Dually at £110 looks ok, but given its lighter, & only results in a 3mm difference in a mounted Knard tyre, I think the P35 at £67 looks a goer for my rebuild.
I've found the above and similar measurements for 26" fat tyre comparisons a little misleading.
The Knard fits fine on a Flow but needs to be run at a higher pressure to reduce squirm and roll etc.
This is bound to have a knock on effect for a bike/tyre etc meant to run low ish pressures.
That said if you prefer a firmer tyre then there isn't an issue!
hehe...Old and blind me 🙂
Question still stands: is it going to fit?
Cheers!
I.
Lovely job... liking the detail around the chainstay bridge.
Must be pretty damn stable with the BB so far below the axles n all 😀