RobinJI Posted October 16, 2005 Report Share Posted October 16, 2005 I just noticed that alot of the 2006 kona jump bikes at work have Truvative ISIS external bottom brackets, I realy like the idea of these as it gives the advantages of the Shimano/raceface systems but without the lack of trials compatability. My only consern is that on stock bikes the bearing housing may be a bit vunerable, But on Mods the sump guard would protect it anyway. What do you lot think? a good idea or not? http://www.sram.com/en/truvativ/mountain/b...er/howitzer.php (Although in this picture it doesnt apear to have a ISIS interface, I assure you it does on the production models.) Quote Link to comment Share on other sites More sharing options...
Badboy Posted October 16, 2005 Report Share Posted October 16, 2005 Looks to me to be very similar to the CODA cranks Mr Ashton used to have on his Cannondales. External bearings. I may be wrong though Quote Link to comment Share on other sites More sharing options...
Bruiser1 Posted October 16, 2005 Report Share Posted October 16, 2005 Echo's been busy with external bb's. Go to the echobikes site (and the other deng brands) if you missed the news. I think the most significant advantage is now the bearings are MUCH larger than on current ISIS bb's, so they're not gonna explode on you like they tend to do now. About the external cup issue, we'll just have to wait and see how they hold up to smacks. I know I do hit my bb shell everynow and then, but i guess it's nothing a piece of plexi glass and some heat can't protect (make a cool protector plate that follows the shape of the bb area.... or something). Plus you can't deny they look pimp, and come in every color. The gold one would look quite nice on my white levelboss. Quote Link to comment Share on other sites More sharing options...
RobinJI Posted October 16, 2005 Author Report Share Posted October 16, 2005 Cool, chears, I must have missed the news about them making external BBs, I still like truvatives idea though because it keeps everything interchangeable rather than being stuck with one make. P.S. The chain in that picture looks preaty fooked. Quote Link to comment Share on other sites More sharing options...
Blackghostknife Posted October 16, 2005 Report Share Posted October 16, 2005 HAha good spot the chain really does look f**ked.. was gunna say echo one aswell. a nice green one for me when they come out :turned: Quote Link to comment Share on other sites More sharing options...
Tomm Posted October 16, 2005 Report Share Posted October 16, 2005 HAha good spot the chain really does look f**ked.. It's because they didn't even bother to put the bike together properly to take pictures. They just half put the chain together. Quote Link to comment Share on other sites More sharing options...
Mark W Posted October 17, 2005 Report Share Posted October 17, 2005 Both Shimano and RaceFace are doing external BB's now, with Shimano's Saint crankset having outboard bearings, I think? Anyway, it's a good idea for mtb's. Larger bearings are pretty much always good. I was sceptical of the idea at first, but Matt Hudson (mathuds0 on here) has a Fly BB on his Kona bike - think it was the first of the "nu skool" outboard BB's - and it seems to have held out pretty well. The bearings have shit their load now, but at least they're replaceable on their own, plus the BB's ridiculously easy to set up. Bit shit as you can't use FFW with it, but there we go. Probably a good idea if you can find a BB long enough for most frames now? Quote Link to comment Share on other sites More sharing options...
tipsy Jock Posted October 17, 2005 Report Share Posted October 17, 2005 If i go along the ISIS route i'm defenately getting one. I can't see how a few knocks will damage the bb/ bb shell, it threads in what an inch if not more? Pete Quote Link to comment Share on other sites More sharing options...
Will Arnold Posted October 17, 2005 Report Share Posted October 17, 2005 If i go along the ISIS route i'm defenately getting one. I can't see how a few knocks will damage the bb/ bb shell, it threads in what an inch if not more? Pete but a meaty sidehop to bb cup could make it go eggo? along with the bb shell of the frame? Quote Link to comment Share on other sites More sharing options...
Mark W Posted October 17, 2005 Report Share Posted October 17, 2005 If i go along the ISIS route i'm defenately getting one. I can't see how a few knocks will damage the bb/ bb shell, it threads in what an inch if not more? Pete True. When it's done up tight, with everything setup properly, the external housing pretty much is effectively an extension of the BB shell, so it's stiff anyway. Also, it's the same as any other BB? It still threads into the shell, but obviously the shell is unsupported in the middle. However, that is true of any BB so there should be no difference. Equally, ot hit the bearing housing, you'd have to twat your crank arm out the way first, pretty much... Quote Link to comment Share on other sites More sharing options...
MesaMan Posted October 17, 2005 Report Share Posted October 17, 2005 I'm using Shimano Hone BB/Cranks on my Trek Bruiser jump rig and they're sweet! (the same idea as the Echo and that other one) I heard ISIS loosen up quite a lot?! Quote Link to comment Share on other sites More sharing options...
RobinJI Posted October 17, 2005 Author Report Share Posted October 17, 2005 Yeah, I just noticed that they would be crap on Mods because they would skrew the chainline right up. Quote Link to comment Share on other sites More sharing options...
ben_travis Posted October 17, 2005 Report Share Posted October 17, 2005 already discussed before :S, http://www.trials-forum.co.uk/forum/index....topic=62790&hl= i dont believe they are good enough for trials, a couple of smacks to them, and they are knackered. it really is Quote Link to comment Share on other sites More sharing options...
RobinJI Posted October 17, 2005 Author Report Share Posted October 17, 2005 Yeah, soz i was more meaning that it now alows more Front Freewheel compatability because of the ISIS fitting. Quote Link to comment Share on other sites More sharing options...
Mark W Posted October 17, 2005 Report Share Posted October 17, 2005 Yeah, soz i was more meaning that it now alows more Front Freewheel compatability because of the ISIS fitting. Less compatibility, 'cos you'd need a far longer spindle due to the external bearings meaning the freewheel's more likely to hit the BB bearing cup. That's why Echo say their's isn't FFW compatible, despite it being 128mm long... Quote Link to comment Share on other sites More sharing options...
onzamad Posted October 19, 2005 Report Share Posted October 19, 2005 P.S. The chain in that picture looks preaty fooked. i was gonna post that lol Quote Link to comment Share on other sites More sharing options...
Dr. Nick Riviera Posted October 19, 2005 Report Share Posted October 19, 2005 oh noes a stiff link Quote Link to comment Share on other sites More sharing options...
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