dylankeyter Posted December 14, 2007 Share Hi All I recently purchased a bike with a 'dura ace' cassette. I am not proposing that it is not dura ace, but how do you tell between a dura ace 11-23 cassette and an ultegra 11-23 cassette? As far as I know, the cassettes do not have their model (ie dura ace) written on the sprocket. Thanks! Link to comment Share on other sites More sharing options...
ZeroPlay Posted December 14, 2007 Share Hi All I recently purchased a bike with a 'dura ace' cassette. I am not proposing that it is not dura ace' date=' but how do you tell between a dura ace 11-23 cassette and an ultegra 11-23 cassette? As far as I know, the cassettes do not have their model (ie dura ace) written on the sprocket. Thanks! [/quote'] DA is meant to come with a DA lockring (says Dura Ace on it), as far as I know. It's also meant to have some Ti cogs, I think, possibly the biggest 3? I don't have DA, so I'm trying to remember from working on my brother's bike. Link to comment Share on other sites More sharing options...
Zaskar Posted December 14, 2007 Share The Dura Ace has the 3 largest sprokets manufatured fromTitanium. they are mounted on a carrier and are not seperate. you can clearly see a colour diff in the Ti vs. the steel. Im also sure on the lockring it will have a model number of some sorts, 7800 if its DA, where as the Ultegra says 6600 i think. Link to comment Share on other sites More sharing options...
dylankeyter Posted December 14, 2007 Share thanks, will have a squizz! Link to comment Share on other sites More sharing options...
BMCfan Posted December 14, 2007 Share thanks' date=' will have a squizz! [/quote'] please let us know, this is interesting Link to comment Share on other sites More sharing options...
dylankeyter Posted December 14, 2007 Share indeed, lockring has 6600 on it, not complaining though, its a 12-23, better for league than a 11-23! Link to comment Share on other sites More sharing options...
Johan Bornman Posted December 14, 2007 Share indeed' date=' lockring has 6600 on it, not complaining though, its a 12-23, better for league than a 11-23![/quote'] Therefore it is an Ultegra cassette, which is the better of the two - your luck. Titanium is a wholly inappropriate material for sprockets. Link to comment Share on other sites More sharing options...
dylankeyter Posted December 14, 2007 Share indeed' date=' lockring has 6600 on it, not complaining though, its a 12-23, better for league than a 11-23! [/quote'] Therefore it is an Ultegra cassette, which is the better of the two - your luck. Titanium is a wholly inappropriate material for sprockets. I was not aware of that. I have been mislead into believing that titanium is lighter and stronger than steel? Are Ultegra sprockets made from Alu, steel or alloy? Thanks Johan, I always appreciate your insight. Link to comment Share on other sites More sharing options...
JasonW Posted December 14, 2007 Share indeed' date=' lockring has 6600 on it, not complaining though, its a 12-23, better for league than a 11-23![/quote'] Therefore it is an Ultegra cassette, which is the better of the two - your luck. Titanium is a wholly inappropriate material for sprockets. Why? Link to comment Share on other sites More sharing options...
pererace70 Posted December 14, 2007 Share Dylan, that's such a self loving profile pic How'd you go in Die Burger? Did I see you punctured on the road side? Link to comment Share on other sites More sharing options...
Mudsimus Posted December 14, 2007 Share indeed' date=' lockring has 6600 on it, not complaining though, its a 12-23, better for league than a 11-23![/quote'] Therefore it is an Ultegra cassette, which is the better of the two - your luck. Titanium is a wholly inappropriate material for sprockets. Why? Because Johan said so. Link to comment Share on other sites More sharing options...
Johan Bornman Posted December 14, 2007 Share indeed' date=' lockring has 6600 on it, not complaining though, its a 12-23, better for league than a 11-23![/quote'] Therefore it is an Ultegra cassette, which is the better of the two - your luck. Titanium is a wholly inappropriate material for sprockets. I was not aware of that. I have been mislead into believing that titanium is lighter and stronger than steel? Are Ultegra sprockets made from Alu, steel or alloy?Thanks Johan, I always appreciate your insight. Dylan, Titanium is lighter than steel, but not stronger. It is stronger than aluminium though, but not twice as strong. Titanium has about half the density (thus weight) of steel and double the density of aluminium. Compared to steel, titanium is a very poor wear material in applications such as sprockets. It is much softer than steel. Further, titanium is extremely difficult to machine, weld and heat treat. Therefore you'll see lots of reports of cracks in titanium frames. Absolute strength isn't always the whole story. It may be stronger than aluminium, but makes a poorer frame. If you look at titanium's weaknesses, you'll see why it is only used on the top three sprockets of bicycled clusters. Those are the sprockets that racers are prohibited by peer pressure, never to ride in. Titanium is also very expensive, mostly because of the high energy needed to extract it from its mineral form, titanium oxide. Link to comment Share on other sites More sharing options...
XAVAX Posted December 14, 2007 Share WOW!! No REALLY... WOW!!! Johan, haal jou neus uit die W?reld Spektrum uit, jy neuk jou o? op. Link to comment Share on other sites More sharing options...
dylankeyter Posted December 14, 2007 Share Dylan' date=' that's such a self loving profile pic How'd you go in Die Burger? Did I see you punctured on the road side?[/quote'] self loving hey? ego sentric? no, it was merely a photo i liked, and thought would be appropriate as a profile picture. Burger was great, punctured 4 times and sat on the side of the road for 4 hours. Link to comment Share on other sites More sharing options...
dylankeyter Posted December 14, 2007 Share indeed' date=' lockring has 6600 on it, not complaining though, its a 12-23, better for league than a 11-23! [/quote'] Therefore it is an Ultegra cassette, which is the better of the two - your luck. Titanium is a wholly inappropriate material for sprockets. I was not aware of that. I have been mislead into believing that titanium is lighter and stronger than steel? Are Ultegra sprockets made from Alu, steel or alloy? Thanks Johan, I always appreciate your insight. Dylan, Titanium is lighter than steel, but not stronger. It is stronger than aluminium though, but not twice as strong. Titanium has about half the density (thus weight) of steel and double the density of aluminium. Compared to steel, titanium is a very poor wear material in applications such as sprockets. It is much softer than steel. Further, titanium is extremely difficult to machine, weld and heat treat. Therefore you'll see lots of reports of cracks in titanium frames. Absolute strength isn't always the whole story. It may be stronger than aluminium, but makes a poorer frame. If you look at titanium's weaknesses, you'll see why it is only used on the top three sprockets of bicycled clusters. Those are the sprockets that racers are prohibited by peer pressure, never to ride in. Titanium is also very expensive, mostly because of the high energy needed to extract it from its mineral form, titanium oxide. Thank you Johan, you are very wise and indeed the king of bicycle maintenance! Link to comment Share on other sites More sharing options...
shade Posted December 14, 2007 Share Originally posted by Johan Bornman "If you look at titanium's weaknesses, you'll see why it is only used onthe top three sprockets of bicycled clusters. Those are the sprocketsthat racers are prohibited by peer pressure, never to ride in." .. bwhaa haa.. i think its more a case of less force and a smoother stroke being exerted on those sprockets , due to mainly used for climbing.. but thats just my opinion Link to comment Share on other sites More sharing options...
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