Im shortly having a frame built for me and although i know mostly what i want theres a few points im unsure of. It will have short stays around the 420mm mark and be designed around 120mm to 140mm of travel. It will have swinging dropouts, This bike is going to be for playing on and will need to be built strong.
points im uncertain of.....
ISCG mounts, do i need them on this sort of frame or are they not needed
headtube would i be best of having oversized or tapered again not sure which will be most useful
and then finally the frame builder quite often curves the toptubes and stays and i like the look of it but does it weaken the tubes? Ihave no idea 
Bike Forum
29er frame design, what would you have
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Posted 4 months ago #
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On-one are having some 2.4" 29er tyres made (I think) so you might want to consider tyre clearance if you're looking at a chunky build.
Posted 4 months ago # -
From an engineering point of view, a straight tube will be stronger than a curved one if everything else is equal, except in the special case of a load in the centre of the tube, eg. a bridge.
Posted 4 months ago # -
I want room for 3" tyres at back, for when Charlie seduces surly into making a 2.9
Posted 4 months ago # -
420mm chainstays with clearance for 3" tyres is going to be interesting. Are you looking at a curved seat tube? Might help if you design it around a single chainring (no clearance for front mech required).
Posted 4 months ago # -
Dropper post bosses
Tapered headtube as it gives the option of integrated/traditional lower headset cup to raise lower the front end.
Posted 4 months ago # -
Will only ever be ran 1x9 or ss, and yes seat tube will be curved
Posted 4 months ago # -
Was thinking about dropper posts have never used one before though
Posted 4 months ago # -
If you want (genuine) 420mm stays you basically can't have a front derailleur unless you do something really odd with the ST, so you might as well give it ISCG tabs. Unless you really need the standover, I would recommend not bending the top tube.
Posted 4 months ago # -
26" wheels
Posted 4 months ago # -
Tapered headtube as it gives the option of integrated/traditional lower headset cup to raise lower the front end.
Depends on the taper, but I'd look at a straight 44mm ID headtube for maximum flexibility.
Posted 4 months ago # -
Cheers Sam i was thinking the straight 44mm route as well, the bend in the top tube this builder sometimes uses is more the cruiser look, I was thinking more of the bends in seat stays as it gives the bike a curvy look
Posted 4 months ago # -
I'd look at a straight 44mm ID headtube for maximum flexibility
I'd look at 1.5" for maximum flexibility
Posted 4 months ago # -
Posted 4 months ago #
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God damn thats nice!
Posted 4 months ago # -
I'd consider the ISCG for 1x9, more chainguide options.
Posted 4 months ago # -
Sounds very much like the Kona Honzo 29er frame which is due to arrive to me this week. That has ISCG tabs, sliding dropouts, 16.3" chainstays, good tyre clearance, dropper post guides, 44mm headtube and based around 120mm travel.
No room for a front mech so ss or 1x9 or 10 only (mine will be 1x10).
You can have a look on the Kona world website to get an idea of how the frame looks. Top tube is straight as well which i prefer to bendy ones (purely for looks) and standover is never an issue for me anyway.
Posted 4 months ago # -
Well, they look cool (and Black Cat do a good job of getting the curve radii lined up correctly between the TT and stays) but I'd have thought that for this style of bike that if you want it curved any way it'd be the other way.
I'd look at 1.5" for maximum flexibility
What, so you can use all those 1.5 standard 29er forks out there?
Posted 4 months ago # -
I know what your saying on the curves Sam and I'm going to go straight toptube, would having the seatstays bent that way weaken them though? The stays on my Jones are bent like that and it feels solid
Posted 4 months ago # -
Have looked at the honzo and it is similar to what I'm after, have been on waiting list for this a year and need to get it right :D,
Posted 4 months ago # -
What, so you can use all those 1.5 standard 29er forks out there?
No, so you can get maximum headset flexibility for traditional/integrated/anglesets
Posted 4 months ago # -
I'm jealous, nice frame, don't forget to post up pics of full build.
So couple of questions
A: what height are you?
B: when are you selling it?
C: is postage included?Posted 4 months ago # -
Well, any MTB stays are going to be bent somewhere, and many are bent in the way you are suggesting, so I'm sure they will be fine.
Posted 4 months ago # -
No, so you can get maximum headset flexibility for traditional/integrated/anglesets
44mm ID does exactly that. 49.6 ID headsets are less readily available, and the size of headtube required for one looks even more weird on a steel frame. In fact I'm not even certain I've seen 49.6ID headtubes in steel.
Posted 4 months ago # -
I like that!
My ideal 29er;
Sized between a medium and a large Singular Swift (top tube length) and the same geometry but with no suspension correction so the head tube can be ~2" lower, and a shorter seat tube by 2" so the top tube can be well out the way.
Posted 4 months ago # -
44mm ID does exactly that.
I have yet to see a 44mm angleset for tapered forks, likely be one along soon though.
Posted 4 months ago # -
I think this ticks most of the boxes sorry chainsaty is 407 to 427
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Posted 4 months ago # -
that ticks a few too many boxes in the rear triangle aesthetic department, IMO at least!
Posted 4 months ago # -
Hi Ringo (I was in the T5 at SSUK)
I have been having very similar thoughts to you recently (and coveting every new frame that appears on the Black Cat website!!), Not quite yet put the cash togther but I might have to get my name on the list if you have been waiting that long!
My wish list:- 120mm forks
- swinging or twosouls sliders
- short stays/curved seat tube
- Straight downtube (with extended (19" ish forward facing seat tube)
- 44mm head tube (Eighteen bikes have made one)
- ISCG mount (to run 1x6/9/10/11 if needed)
- Slackish front
- Room for 2.3 tyres, so prob 73mm BB, no chainstay yolkWhen the Honzo details were released it seemed to tick a lot of boxes, although I think 27.2mm seat tube would give me a bit more comfort. I'm also 11 stone-ish so I would probably be carrying unnecesary weight.
Posted 4 months ago # -
Hi oxy, how's it going, my son still reminds me how I lost to you in the rollapalooza
$500 secures you a place on the waiting list giving plenty of time to save have looked at other frame builders and spoke to a fair few, I love the look of these cats though
Posted 4 months ago # -
Ah yes, the rolla
Yeah - the Hand Made Bike Show in Bristol was really informative last year. Hoping to go this year too, as it looks like being a bit bigger too.
Lots of frame builders out there, but not many pics of recent work. I'm really interested in 18Bikes too, but you're right, the cats are a work of art.
It's also finding someone who is confident doing something a bit different - lots of "custom" builders seem to be custom within certain narrow parameters.
Now $500 does not sound too bad - I've just raised that selling Transformers!
Posted 4 months ago # -
Black Cats are lovely bikes. Too nice for a gnar-build though ) Rigid-specific, light, SS-orientated.. that'd be my kind of Cat. Very nearly was 18 months ago but something else came along.
Posted 4 months ago # -
1. Tapered Headtube
2. Full Length Gear cable Outers
3. Geared or Gears, sliding do, swapouts or ec bb dont care.
4. No rack mounts.
5. Simple graphics, preferably anodised.
6. 100mm to 120mm fork but could also run rigid.
7. Available in Alu, Steel or Carbon
8. Decent warranty / support.
9. make my mates go wow.
10.make me a better rider.Well 9 and 10 were made up to make up numbers, I could also have costs less than £400 otherwise a yeti big top would probably do the job.
Posted 4 months ago # -
points im uncertain of.....
ISCG mounts, do i need them on this sort of frame or are they not needed
headtube would i be best of having oversized or tapered again not sure which will be most usefulIf it's for playing on and has 420mm stays, get ISCG tabs. You'll not get an FD on it anyway so you may as well have the chain device options.
Headtube - 44mm ID / XX44 std for steel bikes is a good idea, for a longer-forked 29er I'd say it should be a standard feature. Stiff forks are good.Curved tubes tend to be straight-wall so I'd go for straight, butted tubes in the main frame if you want it light. Curved is nice if style is more important and the straight wall tubes may be a bit more ding resistant too.
However the big question for a Black Cat custom is - what paint...? )
Posted 4 months ago # -
I'm pretty sure Black Cat is (rightly) rather smug about being able to to put curves into butted tubes on most of his bikes. Also love his head lug / gusset thingy.
And it HAS to have his swinger dropouts.
Head tube has to be 44mm - don't think anyone makes a short (for a 29er) tapered steel head tube. And anyone talking 1.5" and anglesets for a custom steel 29er isn't really getting the point.
I'm riding 405mm chainstays and loving them - 420mm will still feel very agile compared to long vehicles like Trek 29ers.
Posted 4 months ago #
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