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 3×10 drivetrain should work.
Tapered external cup headtube and tapered steerer – this is the same as is on the Puffin full fat frames as well.
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.
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.
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.
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.
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)
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 Singulary. Something about the blue Swift that made me fall in love straight away.
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.
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.
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?