Chris Posted August 18, 2006 Report Share Posted August 18, 2006 (edited) hey there...I just got my custom frame. A few things didn't turn out the way I ordered it... so it's going back --> Chance to redesign it.I just wanted to get your opinions on that disc mount. The dropout is 10mm thick, cnc'ed I guess. And there's a gusset, about 10mm thick. So what you think? Is the gusset strong/big enough? Could it be placed better?There are several disc mount designs out there, which one do you consider the best? Not just by the looks of course More from the technical side! Also, what's the best place for the gusset? Simtra MKBMegamo Edited August 19, 2006 by Chris Quote Link to comment Share on other sites More sharing options...
Walleee Posted August 18, 2006 Report Share Posted August 18, 2006 (edited) I duno, if you think about the forces coming from the disc brake, i'd imagine the MBK has got it right, in that if you imagine a straight line coming from the disc, through the caliper, and to the frame. With the simtra, i'd imagine the seatstay's will also have to deal with some of the forces before the re-inforcing bar does......With the MBK it might just go straight through the bar to the chainstay, which might not be the best thing either.....It's a hard one.....Edit: the one in the first picture seems alright, is that what you've got at the minute? Edited August 18, 2006 by jake1516 Quote Link to comment Share on other sites More sharing options...
Chris Posted August 18, 2006 Author Report Share Posted August 18, 2006 Yeah the first one is mine... but the disc mount was placed totally wrong.Is that gusset strong enough? Or should I make it 20mm (instead of 10mm)? Quote Link to comment Share on other sites More sharing options...
Walleee Posted August 18, 2006 Report Share Posted August 18, 2006 10mm is mighty thick really, if weight is a non-issue for you go for it certainley, but aside from adding further gusset's or whatever, I don't think there's much more that can be done.... Quote Link to comment Share on other sites More sharing options...
Chris Posted August 18, 2006 Author Report Share Posted August 18, 2006 Alright, I'll see if I make it any stronger. The added weight shouldn't really matter, as the frame weighs already 2,3 kg Quote Link to comment Share on other sites More sharing options...
Will Arnold Posted August 18, 2006 Report Share Posted August 18, 2006 megamo and simtra have got it stop on disc mount wise, but MBK wins on the gusset thingy side of things Quote Link to comment Share on other sites More sharing options...
dave33 Posted August 18, 2006 Report Share Posted August 18, 2006 that mount will crack on the weld the disc mount needs to over lap the chain stay like the mbk and simatra, no need for it to be 10mm wide as mine ner broke, it just cracked on the weld joining it and it was about 5mm wide id go for a mount that goes up the stay more Quote Link to comment Share on other sites More sharing options...
Mark W Posted August 18, 2006 Report Share Posted August 18, 2006 Dave speaketh the truth. If you look at it, the force from the disc is going to be going straight onto the join between the dropout/discmount and the seat-stay weld, which ain't great. When you move the mount to the right place I guess that might cover it, but a little bar going from the disc mount to further up the seat-stay like the other frames have might be a sound idea? Quote Link to comment Share on other sites More sharing options...
Chris Posted August 19, 2006 Author Report Share Posted August 19, 2006 (edited) that mount will crack on the weld the disc mount needs to over lap the chain stay like the mbk and simatra, no need for it to be 10mm wide as mine ner broke, it just cracked on the weld joining it and it was about 5mm wide id go for a mount that goes up the stay moreSo you mean the part of the disc mount I've marked in the pic, should overlap the chainstays? Which it does in the pic...Problem is, my disc mount was placed totally wrong. The one in the pic here is a standard IS mount, but it should be a +40mm. When the mount is further left, it overlaps the chainstay - then it will be fine?So if I got it right, the best solution would actually be to make a massive dropout/disc mount like on the pic? I know it looks shit and would weigh a ton... but it would be the strongest? Edited August 19, 2006 by Chris Quote Link to comment Share on other sites More sharing options...
Greetings Posted August 19, 2006 Report Share Posted August 19, 2006 I'd go for the Simtra design. I wouldn't say that having a huge block of metal act as the adaptor and dropouts is a good idea. It won't help much. My friend had a Megamo Equip Pro with 2 disc brakes (8" rear) and it took 4 years of constant abuse before it cracked. His mount was slightly different to the picture you put up. Quote Link to comment Share on other sites More sharing options...
dave33 Posted August 19, 2006 Report Share Posted August 19, 2006 summit like thatjust to give you an idea of the shape perhaps going longer up the stay for a stronger joinll have think tomoro if i get time and do a proper one for you, thats just a quick idea Quote Link to comment Share on other sites More sharing options...
Chris Posted August 19, 2006 Author Report Share Posted August 19, 2006 (edited) Cool thanks. Maybe my last pic was a little overkill...What about this here? A solid one piece dropout/disc mount (yellow), then the welds (red) and a gusset. Edited August 19, 2006 by Chris Quote Link to comment Share on other sites More sharing options...
dave33 Posted August 19, 2006 Report Share Posted August 19, 2006 (edited) ok i cant upload it Edited August 19, 2006 by dave33 Quote Link to comment Share on other sites More sharing options...
Chris Posted August 19, 2006 Author Report Share Posted August 19, 2006 (edited) Ok I see what u mean. But wouldn't it be stronger, if the weld is further away from the bolt hole/disc brake forces?Like this Edited August 19, 2006 by Chris Quote Link to comment Share on other sites More sharing options...
dave33 Posted August 19, 2006 Report Share Posted August 19, 2006 yea thats just quickly drawn up but id say that you need to have the top bolt on top of the stay, the dropout its self isnt gonna break if its gonna break its gonna be the weld ll draw a decent one up tomoropast my bed time Quote Link to comment Share on other sites More sharing options...
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