1337 Trials Posted February 24, 2009 Report Share Posted February 24, 2009 Hellooo. Im looking for some new cranks as im going ISIS my my square taper ones are annoying me. Just wondering is there a big difference in performance/feel between the echo forged and the echo CNC? Thanks~ Quote Link to comment Share on other sites More sharing options...
Revolver Posted February 24, 2009 Report Share Posted February 24, 2009 (edited) CNC ones should be stronger.Something to do with how the metal crystals form when the forged ones are made, weaknesses form in there. Edited February 24, 2009 by Bruce Lee Quote Link to comment Share on other sites More sharing options...
1337 Trials Posted February 24, 2009 Author Report Share Posted February 24, 2009 Ahh cheers. Are all deng parts the same quality such as echo/adamant and czar etc? Selectbikes have the CNC ISIS cranks for £50-£60 so I was thinking of getting them but they havnt got them in black or red Quote Link to comment Share on other sites More sharing options...
Revolver Posted February 24, 2009 Report Share Posted February 24, 2009 Ahh cheers. Are all deng parts the same quality such as echo/adamant and czar etc?Quality, yes.I'd guess they're all similarly strong, you'd have to look at the simulations to see though. Quote Link to comment Share on other sites More sharing options...
ZeroMatt Posted February 24, 2009 Report Share Posted February 24, 2009 Pretty sure forged would be stronger, what with the refining of the grain flow Quote Link to comment Share on other sites More sharing options...
forteh Posted February 24, 2009 Report Share Posted February 24, 2009 CNC ones should be stronger.Something to do with how the metal crystals form when the forged ones are made, weaknesses form in there.Nope you're wrong Forging produces a stronger final shape than machining from solid billet. As the piece is hammered into shape (the forging process) it alters the grain flow within in the material and this gives a much stronger structure.Tryall and monty cranks are forged and then the pedal thread and splines/tapers are machined on using (most probabably) a cnc machine. Middleburns are net forged, that is the shape of them is created with a very close tolerance forging and then they are machined (again by cnc), that is why they have an organic sweeping shape that cant be machined easily/cheaply I dont know if the echo cnc cranks are machined from a forging or from plain billet. Quote Link to comment Share on other sites More sharing options...
1337 Trials Posted February 24, 2009 Author Report Share Posted February 24, 2009 Pretty sure forged would be stronger, what with the refining of the grain flowhmmm weird. ISIS are usually alot more expensive. Now for another quick question. Which is stronger/gives a strong feeling ISIS or square taper or is it personal perferance? Quote Link to comment Share on other sites More sharing options...
ZeroMatt Posted February 24, 2009 Report Share Posted February 24, 2009 Isis cranks seem to feel stiffer than the old square jobbies, aswell as that the isis spline lasts longer than the gash square taper. Quote Link to comment Share on other sites More sharing options...
A.Baxter Posted February 24, 2009 Report Share Posted February 24, 2009 cnc echo's are stronger than the forged ones. The forged ones get easily masged up on walls when u bash them etc ... and the cnc'd ones seem to be .... tougher.Also isis are much better than square taper, the isis splines last loads longer and the square taper can be rounded off quickly if they are not tight enough.Adam Quote Link to comment Share on other sites More sharing options...
Revolver Posted February 24, 2009 Report Share Posted February 24, 2009 Hmm.Well, I spose it figures. Quote Link to comment Share on other sites More sharing options...
forteh Posted February 25, 2009 Report Share Posted February 25, 2009 Isis cranks seem to feel stiffer than the old square jobbies, aswell as that the isis spline lasts longer than the gash square taper.There is a larger interface between the crank and the BB so it will feel stiffer, especially if you're running FFW and have a large cantilever load to bend the axle.cnc echo's are stronger than the forged ones. The forged ones get easily masged up on walls when u bash them etc ... and the cnc'd ones seem to be .... tougher.Also isis are much better than square taper, the isis splines last loads longer and the square taper can be rounded off quickly if they are not tight enough.The cnc ones are stronger because deng uses a much better grade of aluminium for the cnc cranks, if he were to use the same for the forged cranks they would be stronger Square tapers are absolutley fine if you have a decent BB and cranks, Ive not rounded a single taper BB in the last 15 years of riding bikes. The main problem with isis is that once you have removed and refitted the cranks a couple of times, the splines wear and the cranks develop play - apart from bodging with shims the only way to resolve this is to buy a new set of cranks. With square taper there is always a nice tight taper fit to pull up onto Im currently running an ancient hope hollow ti BB and Im not in the least concerned that its going to snap with my riding. Quote Link to comment Share on other sites More sharing options...
eskimo Posted February 25, 2009 Report Share Posted February 25, 2009 The 7075 cranks have better wear resistance on the pedal threads compared to the 6061 cranks i've noticed. 7075 is known to be better anyway for such applications. Only if i stuck at my engineering course many a year ago Quote Link to comment Share on other sites More sharing options...
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