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How to build a bike frame PRE feature

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How to build a bike frame PRE feature
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flag draco
Posted: Nov 6, 2009 at 6:46 Quote
Alright mostly for the home-made bike frame guys, but open to all:


I'm going to do the full-tilt how-to on building a bike frame.

Lets hear what specifics people would like to ensure that I cover?

aka: hardtail, full squish, bmx, road? all of the above?

which frame style would you like me to elaborate the most on?

questions on standards or anything?

I'll make sure its dialed, but I thought I could cater to the popular areas too.


gimme your thoughts:
flag jonbikes
Posted: Nov 6, 2009 at 7:04 Quote
Although I did not post in the home made bikes thread much, I have been following it. As a welder (about to finish my diploma, already have 4 tickets, testing another 6 including pipe in a few months) an DH rider I am very interested in building my own frame. Since I ride and race DH obviously I would be interested in the DH end of things.

I'm looking forward to this thread.
flag 3lfd3wd
Posted: Nov 6, 2009 at 11:33 Quote
I have a friend who is, like me, at university, looking into building a steel DH frame for ourselves, one each, designed to our own specs, see if we can make something of it.

From what I've gathered in the HMBs thread, jig construction seems like a major part of the process, so maybe give that a good amount of coverage, and any helpful stuff on things people might find hard like getting tube mitres for various angles and the like?

Either way, I'm sure this will be a great resource to have, and in case it does all happen, thanks in advance!
flag CTfreerider6
Posted: Nov 6, 2009 at 11:36 Quote
i say focus in on a full squish frame, for the most part anything that you do to a hardtail frame would be done on a dually, with a full squish every aspect of building would be covered. make sure to go over jig concepts for that plays a great deal on how easily the frame comes together. give some explanation to how a pivot is made, maybe homemade 4130 links- this is something i want to figure out for my next frame. I am interested in where this thread goes.
flag chazdog
Posted: Nov 6, 2009 at 13:28 Quote
woop count me in, am in my first year of a mechanical engineering course, get to learn to weld in a few weeks, and am using solidworks to doodle practice bike frames.
looking forwards to this!
flag add1cted
O+
Posted: Nov 6, 2009 at 16:33 Quote
Yo I'm definately keen on this, I'm planning to make a single pivot DH rig or trail bike, so if you could give info on how to stiffen up a single pivot that would be mean.
flag dmanj
Posted: Nov 6, 2009 at 16:37 Quote
im deffinately thinking of building a street/dj frame in the near future. wouldnt mind some pointers and stuff on that
flag zwak
Posted: Nov 6, 2009 at 18:25 Quote
YAY! I've been waiting for this since the few build your own bike threads so long ago.

My area is DJ/street, so I'd love to see it covered in depth.

Jigs are the thing I can't wrap my head around. I'd love to see lots of info on it because I would have no idea where to start.
flag david-hill
Posted: Nov 7, 2009 at 1:49 Quote
Yeah draco this'll be good!

i'de say focus on full squish, and hardtail [dj, street and 4x]

but all of them would be good to have lol.
flag brigand
Posted: Nov 7, 2009 at 8:09 Quote
great idea draco!

maybe also 'how to build a jig' would be nice
flag hampsteadbandit
Posted: Nov 7, 2009 at 13:50 Quote
building your own frame / bike is great fun

in 1993 whilst at University in Newcastle (England) I decided with my friend Duncan to build our own frames

here is the "Bombproof D-2", this used an AMP research "mac strut" suspension rear (giving 3.5" of rear travel) mounted on our front triangle and suspension mountings

we bought the AMP kit from Horst Leitner in Ca, USA - he went on to work with Specialized to develop the FSR suspension system that has dominated the bike industry for many years

the big problems with the Mac Strut were lateral flex (due to extreme length of chainstays) and that the rear shock (AMP coil / oil) was a stressed member i.e. part of the seat stay - which cause premature wear on the oil seals and shock bushings

note: the Rockshox Judy DH fork has been adapted to take a Sachs (SRAM) hydaulic disc brake using Sachs front derailleur mounting clamps and superglue - we were the 1st company to install a hydro disc brake to a Rockshox fork, before Rockshox made their forks with a disc brake mount!

photo

these bikes (we made 5 prototype frames in the UK) were raced all over the UK in both National Point Series and local DH races, and in the European Championships

photo

this led to the Bombproof D-3 which had 5" of FSR suspension and its own fork

photo

forks

photo

go build...have fun dudes!!!
flag jonbikes
Posted: Nov 7, 2009 at 14:36 Quote
Wait wait wait...you were one of the guys behind bombproof? That's wicked and I am surprised I did not hear that before.
flag manofsteel
Posted: Nov 7, 2009 at 22:08 Quote
i think that you should show how to make the pivots for a full suspension frame
flag kpilar
Posted: Nov 7, 2009 at 22:38 Quote
hampsteadbandit wrote:
building your own frame / bike is great fun

in 1993 whilst at University in Newcastle (England) I decided with my friend Duncan to build our own frames

here is the "Bombproof D-2", this used an AMP research "mac strut" suspension rear (giving 3.5" of rear travel) mounted on our front triangle and suspension mountings

we bought the AMP kit from Horst Leitner in Ca, USA - he went on to work with Specialized to develop the FSR suspension system that has dominated the bike industry for many years

the big problems with the Mac Strut were lateral flex (due to extreme length of chainstays) and that the rear shock (AMP coil / oil) was a stressed member i.e. part of the seat stay - which cause premature wear on the oil seals and shock bushings

note: the Rockshox Judy DH fork has been adapted to take a Sachs (SRAM) hydaulic disc brake using Sachs front derailleur mounting clamps and superglue - we were the 1st company to install a hydro disc brake to a Rockshox fork, before Rockshox made their forks with a disc brake mount!

photo

these bikes (we made 5 prototype frames in the UK) were raced all over the UK in both National Point Series and local DH races, and in the European Championships

photo

this led to the Bombproof D-3 which had 5" of FSR suspension and its own fork

photo

forks

photo

go build...have fun dudes!!!

thats badass dude
flag nicko17
Posted: Nov 8, 2009 at 13:58 Quote
Basics might be a good idea for some. I see too many questions on the other thread about sizes/welding/jigs.

Standards would be a good idea also.
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