totaltrials Posted August 29, 2008 Report Share Posted August 29, 2008 Everybody saying about "why would you drill holes in the cranks", well it hasn't forfeited much strength and it's saved 50g and I'd bet on it being the stiffest crank under 500g.Have you seen the image on the site and the description, if you can understand it haha: We design the first ECHO CNC crank in 2005 summer. In the last 3 years, zero cranked report. It means it's very strong, so we are sure it's too strong for some riders. So we keep the design as ECHO URBAN crank, for who need something really strong. And remove some grams to make it lighter, as ECHO SL cranks.From the picture at the bottom, you can see there is no special weak point in the crank. Not every crank can be drill for lighter, ECHO crank has "I" shape design, most material on the outside, so even we remove the material inside the cranks still no weak point.Anyone wanna buy an 06 control? .parts are seriously stupid this year, why would u buy drilled bar ends if plastic ones are lighter + cheaper?MatxThe bar ends surprisingly only weigh 14g a set. Look pretty pimp, and you don't have to worry about them popping out every 10minutes.Adam do you know if they will do the tr lever blades seperatley, and would they fit a 04 maggie? You can't get the lever blade sperately at the moment, but the full TR lever will be available: * Extruded 6061 T6 aluminum CNC main cylinder holder. * Compatible for both left or right side. * High strength 7075 CNC level blade. with comfortable end shape, great feeling. * For mineral oil only. * 74g / set, include bolts and flow. * Available in 6 different anodized color.I'd just buy the full lever, they should be pretty reasonably priced too around £45. Quote Link to comment Share on other sites More sharing options...
craigjames Posted August 29, 2008 Report Share Posted August 29, 2008 that disc brake lever looks surprisingly similar to a hayes stroker lever........... Quote Link to comment Share on other sites More sharing options...
thefletch Posted August 29, 2008 Report Share Posted August 29, 2008 (edited) From the picture at the bottom, you can see there is no special weak point in the crank. Not every crank can be drill for lighter, ECHO crank has "I" shape design, most material on the outside, so even we remove the material inside the cranks still no weak point.These cranks could actually be VERY good. All this time I have wondered to myself why this "I" shape hasn't been used before for cranks. The 'stress' and 'strain' forces are at their peak at the outer edges of the crank arms (where, on these cranks, there will be more material), and at the some point near the middle (I'm guessing it would be the perfect centre if the cranks were perfectly symmetrical) their is no stress or strain force whatsoever (the point at which the material has been removed with these cranks).Its the same reason why steel beams used in steel frames for buildings have an "I" cross section, instead of a rectangular cross sectionDeng may have actually thought these through...JoeHaving said that I have now remembered that the monty ti cranks have material removed from the middle of their inner face, and there are probably a few others that do too... Edited August 29, 2008 by thefletch Quote Link to comment Share on other sites More sharing options...
JonMack Posted August 29, 2008 Author Report Share Posted August 29, 2008 Original Tensiles used to have a bit taken out... Quote Link to comment Share on other sites More sharing options...
thefletch Posted August 29, 2008 Report Share Posted August 29, 2008 Original Tensiles used to have a bit taken out...well there we go lolmy point was that by drilling the middle of the crank where the stress/strain forces on each respective sides cancel with each other, shouldn't weaken the cranks much at all Quote Link to comment Share on other sites More sharing options...
Z o o !! Posted August 29, 2008 Report Share Posted August 29, 2008 tell me this is a joke ?#http://tartybikes.co.uk/product.php?product_id=10611 Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted August 29, 2008 Report Share Posted August 29, 2008 tell me this is a joke ?Why would it be? Quote Link to comment Share on other sites More sharing options...
Skoze Posted August 29, 2008 Report Share Posted August 29, 2008 (edited) What's so outrageous? They've always been that price (well they were last time i dabbled in lever blades), nothing's really changed. Edited August 29, 2008 by Skoze Quote Link to comment Share on other sites More sharing options...
Z o o !! Posted August 29, 2008 Report Share Posted August 29, 2008 Price just seems a little ott, o it comes in 6 different colours and is cnc machined. I dont see why the prices are so ridiculous. Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted August 29, 2008 Report Share Posted August 29, 2008 Price just seems a little ott, o it comes in 6 different colours and is cnc machined. I dont see why the prices are so ridiculous.because they've got loads of cnc work, they're not hugely mass produced and the price of alloy has skyrocketed recently Quote Link to comment Share on other sites More sharing options...
JonMack Posted August 29, 2008 Author Report Share Posted August 29, 2008 tell me this is a joke ?#http://www.trials-forum.co.uk/index.php?showuser=13376 Quote Link to comment Share on other sites More sharing options...
Simpson Posted August 29, 2008 Report Share Posted August 29, 2008 Drilled cranks = killed ankles?Montys are bad enough Quote Link to comment Share on other sites More sharing options...
Z o o !! Posted August 29, 2008 Report Share Posted August 29, 2008 tell me this is a joke ?#http://www.trials-forum.co.uk/index.php?showuser=13376Bravo. Quote Link to comment Share on other sites More sharing options...
psycholist Posted August 29, 2008 Report Share Posted August 29, 2008 'I' cross section cranks are great in bending, but cranks also experience twisting as your weight is applied through the pedal rather than directly to the end of the crank. A tubular crank, longer in the axis in which is is bent (Shimano Hollowtech style) is the best shape for optimum stiffness to weight for a crank. It is perfectly true that the holes will have very little effect on the overall stiffness of the crank, but 'I' beams don't resist twisting well at all compared to tubes, they're just easier to make and (useful for trials specifically) they're more impact tolerant... There's a test rig in the university where I work consisting of an I beam concreted into a wall - you can't even feel the deflection in the beam if you hang your whole weight off the end of it, but it's laughably easy to twist the beam (cm of deflection with 10-20kg hung off it) if you apply loads off the beam axis. Quote Link to comment Share on other sites More sharing options...
Jason222 Posted August 29, 2008 Report Share Posted August 29, 2008 There are pics up of the new Zoo's on the tarty website.I want to know the geo!!!! Quote Link to comment Share on other sites More sharing options...
Mark W Posted August 29, 2008 Report Share Posted August 29, 2008 If anyone else can remember the Hi-Fi vs XTP FEA (Or whatever those pics are of...) shots that Deng posted up, it's always as well to take Deng's graphics with a pinch of salt. Quote Link to comment Share on other sites More sharing options...
Alex-Mitchinson Posted August 29, 2008 Report Share Posted August 29, 2008 There are pics up of the new Zoo's on the tarty website.CAD only though. Quote Link to comment Share on other sites More sharing options...
Matt Burrows Posted August 30, 2008 Report Share Posted August 30, 2008 If anyone else can remember the Hi-Fi vs XTP FEA (Or whatever those pics are of...) shots that Deng posted up, it's always as well to take Deng's graphics with a pinch of salt.What, am I missing something here? I thought the Hi-Fi frames were way way stronger than XTPs? Quote Link to comment Share on other sites More sharing options...
Greetings Posted August 30, 2008 Report Share Posted August 30, 2008 Drilled cranks = killed ankles?Have you actually seen the shape of these cranks? It's more likely the I shape will rape your ankles than a few tucked away holes. The Echo CNC cranks were never ankle friendly but adding holes in a fairly inaccessable area won't make things worse.And as Phil has pointed out, the strength of these cranks hasn't been compromised but 50g have been saved. That's what clever weight saving is all about. Quote Link to comment Share on other sites More sharing options...
totaltrials Posted August 30, 2008 Report Share Posted August 30, 2008 I think that's the 3rd post I've read about the risk of ankles being ripped apart.I really can't see how, the holes are tucked away, surely it's the shape and bend of the cranks which makes a crank that knackers ankles, an example is tensile with their very straight armed cranks. I'd more expect the edge of the "I-beam" construction of the cranks to cause more hassle than the holes.The I-beam construction of the cranks is very clever. Exactly what Deng said about the fact theres no strength lost from drilling the holes is right. I also don't think a twisting force is going to affect the cranks, maybe on a long beam, but on a pair of cranks the twist must be so minimal over such a small width compared to the length.Anyway, I'd be pretty sure if you bought the sl cranks you won't have a problem with them, the design is spot on as far as cranks go. Quote Link to comment Share on other sites More sharing options...
Davetrials Posted August 30, 2008 Report Share Posted August 30, 2008 tensiles used to bugger my shoes, but only cos i ride with spastic foot, change ur riding style and adapt, or dont buy the cranks and f**k off out of this topic. Quote Link to comment Share on other sites More sharing options...
JonMack Posted August 31, 2008 Author Report Share Posted August 31, 2008 Yeah they f**ked mine right up too, but I just lived with it, then got new cranks. Wamp!! Quote Link to comment Share on other sites More sharing options...
Jason222 Posted August 31, 2008 Report Share Posted August 31, 2008 Deng needs to make 175 length cranks. Quote Link to comment Share on other sites More sharing options...
totaltrials Posted August 31, 2008 Report Share Posted August 31, 2008 Deng needs to make 175 length cranks.Yep, I agree. But 170 is a happy medium, otherwise, he's going to produce 6 colours in 160, 170 and 175. Although I think 175 would be better than 170. Quote Link to comment Share on other sites More sharing options...
Revolver Posted August 31, 2008 Report Share Posted August 31, 2008 That's the point that dude came up with when he made his entirely CNC'd frame. It needed crosslinks for strength, and it made it look like a bridge.I do like those cranks though, they look cool. I'd buy some as I'm not terribly likely to snap anything, but it might not be worth the price. Especially when I got my tensile cranks for £30.Hmm, I've clipped my ankle on my tensiles. But then, when I rode yesterday, I didn't.I suppose its one of those things you've just got to learn to avoid. Quote Link to comment Share on other sites More sharing options...
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