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PostPosted: Sun Apr 15, 2012 7:52 pm 
Dirt Disciple
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Joined: Sun Apr 15, 2012 2:41 pm
Posts: 39
Location: Aberdeen, UK
Nice bike :)

Once I'm finished testing and modifying the plastic printed clamp I could post it to you to see if it fits your frame. Doubt it fits, but worth a try perhaps? Same goes for anyone else wanting to try it for size.

Rae


Last edited by Rae on Sun Apr 15, 2012 8:23 pm, edited 1 time in total.

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PostPosted: Sun Apr 15, 2012 8:01 pm 
retrobike rider
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Location: Manchester
That would be great thanks. I think though like you say the chainstay angle will be different.

Chris


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PostPosted: Sun Apr 15, 2012 11:23 pm 
Gold Trader
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Loving your work. Just a thought, I've seen some older frames with the disc mount between the stays rather than in the more conventional position which your clamp caters for. Would it be worth investigating a mount that fits within the stays, as whilst I think yours looks great, you may be able to create a more elegant solution, as well as potentially reduce the amount of hose needed?

Just a thought?


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PostPosted: Sun Apr 15, 2012 11:34 pm 
Dirt Disciple
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Location: Aberdeen, UK
Thanks, sounds like a great idea, have you a link to an example? The dropout takes up a fair bit of the corner so it might be tight for space, but if it saves weight it would be worth a go. Any info would be appreciated :)


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PostPosted: Mon Apr 16, 2012 3:47 pm 
retrobike rider
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Location: A wretched hive of scum and villainy...
Quote:
have you a link to an example

Here are a few...
ImageImageImageImage
It does look a bit tight in there, though...

All the best,


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PostPosted: Mon Apr 16, 2012 3:55 pm 
Retro Guru

Joined: Mon Apr 03, 2006 5:11 pm
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Nice work, although a lot of effort to go to!

I've got the later version of this UK made RSP titanium frame, complete with disc mount: http://www.retrobike.co.uk/forum/viewto ... highlight=


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PostPosted: Mon Apr 16, 2012 4:06 pm 
Old School Grand Master
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Location: Herts UK
Rae wrote:
Thanks, sounds like a great idea, have you a link to an example? The dropout takes up a fair bit of the corner so it might be tight for space, but if it saves weight it would be worth a go. Any info would be appreciated :)


some old Gary fisher and Klein frames had mount on the chain stay with the brake calliper sitting in between the chain and seat stay triangle.

neat solution but there are few callipers of the correct shaoe that will fit there so choose your calliper first!!!

below is how I used a Magura front calliper (the only one I could find that would fit but they may be others) with my DIY adapter; it works very well in fact :lol: but as the bleed screw is below the inlet, the calliper needs to be removed from bike in order to be bled (a minor inconvenience).

Image

another suggestion wold be to make use of the axle drop out as a mounting point; that would make your adapter less clunky.

have you looked into getting a bracket welded on - that would be the ideal solution.


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PostPosted: Tue Apr 17, 2012 12:17 am 
Dirt Disciple
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Joined: Sun Apr 15, 2012 2:41 pm
Posts: 39
Location: Aberdeen, UK
Evening,
Thanks for all the examples. I don't think I can get it to fit there I'm afraid. A few pix of the Mk2 clamp below. Weight is up slightly to 137g but it uses the dropout as an additional mounting point now. I'm planning on a 160 / 180mm disc, hence the need to beef it up.
I'm planning to 3D print tomorrow then hopefully sending it out for machining :) I will post some 3D part pix tomorrow.
Any more suggestions / ideas for the clamp?
Rae

Edit: Weight is actually 137g. 150g is with steel bolts. As if a few grams mattered ;)


Attachments:
Clamp Mk2.jpg
Clamp Mk2.jpg [ 130.32 KiB | Viewed 1165 times ]
Clamp Mk2 iso1.jpg
Clamp Mk2 iso1.jpg [ 60.81 KiB | Viewed 1165 times ]
Clamp Mk2 iso2 rear view.jpg
Clamp Mk2 iso2 rear view.jpg [ 62.08 KiB | Viewed 1165 times ]


Last edited by Rae on Tue Apr 17, 2012 9:03 am, edited 1 time in total.
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PostPosted: Tue Apr 17, 2012 12:35 am 
retrobike rider
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Joined: Thu Apr 17, 2008 1:24 am
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Location: Manchester
Does it need the bit between the dropout and chainstay clamp?
Also what about the piece between the disk calliper mounting holes? Is that needed? Could the calliper adaptor hold everything in place on its own? That would look pretty good!
Just thinking out loud really, I have no idea if it would work!


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PostPosted: Tue Apr 17, 2012 12:43 am 
Dirt Disciple
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Joined: Sun Apr 15, 2012 2:41 pm
Posts: 39
Location: Aberdeen, UK
I see what you mean. Use the brake bolts and brake bracket itself to hold the top section together. Yes, I'll take a look. Getting a loan of a caliper and rear disc wheel tomorrow so I'll see if there is space. If it works it'll drop quite a bit of weight. Is the caliper itself strong enough? Worth a look.
Thanks for the suggestion :)

The idea behind the support on the back is to rigidly clamp the flat faces of the dropout, holding everything straight and true. In theory it isn't required but I did it for extra strength.


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