The all new Pinarello Dogma F8...
Moderator: robbosmans
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The main reason Italian threads are functionally obsolete is due to the thread direction. English threaded BB's have a left hand thread on the drive side. Italian threads have a right hand thread, meaning "righty tighty, lefty loosey". The problem with this stems from the way the bearings roll against the surfaces. When you pedal, clockwise, the bearings roll counterclockwise against the spindle. Transfer this to the inner races of the bearing and the counterclockwise force tends to want to turn the bearing counterclockwise (left). With an Italian threaded bb, this means the force is trying to lossen the bearing. This is why you'd often see Itlaian threaded BBs spin loose and unthread themselves from the BB. This can't happen with a left hand thread because the forces will tend to tighten rather than loosen the assembly. Of course, it the Italian BB is properly tight in the first place you shouldn't experience this, but if it is at all loose to begin with (meaning less than really tight), there will be a natural tendency to spin out.
Why Pinarello continues to use this is beyond me. Otherwise, it's a very nice bike. But the marketing spin is quite laughable, but that's pretty much par for the course these days no matter which manufacturer you're talking about.
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Why Pinarello continues to use this is beyond me. Otherwise, it's a very nice bike. But the marketing spin is quite laughable, but that's pretty much par for the course these days no matter which manufacturer you're talking about.
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Last edited by Calnago on Fri May 30, 2014 8:58 pm, edited 1 time in total.
Colnago C64 - The Naked Build; Colnago C60 - PR99; Trek Koppenberg - Where Emonda and Domane Meet;
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Calnago wrote:The main reason Italian threads are functionally obsolete is due to the thread direction.
I love threaded bottom brackets and prefer them on my bikes. I've never had any issues with them. I don't see a real world issue with Italian bottom brackets. 65 Nm of torque is a lot. In practice there should be no possible way a decent working bearing could loosen a bottom bracket torqued to 50+ Nm.
@Bombertodd: You are correct... if the threaded Italian BB is properly torqued, it should be just fine. But in practice, some don't get properly torqued and these are the ones that loosen up. With a BSA threaded BB, even if it is not quite tight enough, it would not spin out because of it. I'm all for threaded, but get rid of Italian threads. No good reason to be using them.
I am a big advocate of BSA threaded BB's... Hate Hate Hate pressfit BB's. They are a product of the molded carbon frames and it's just too difficult to get them seated in there properly. Boo hoo.... so now we're stuck with all this pressfit crap and the BB manufacturers scrambling trying to come up with decent solutions.
I am a big advocate of BSA threaded BB's... Hate Hate Hate pressfit BB's. They are a product of the molded carbon frames and it's just too difficult to get them seated in there properly. Boo hoo.... so now we're stuck with all this pressfit crap and the BB manufacturers scrambling trying to come up with decent solutions.
Last edited by Calnago on Sat May 31, 2014 2:05 am, edited 1 time in total.
Colnago C64 - The Naked Build; Colnago C60 - PR99; Trek Koppenberg - Where Emonda and Domane Meet;
Unlinked Builds (searchable): Colnago C59 - 5 Years Later; Trek Emonda SL Campagnolo SR; Special Colnago EPQ
Unlinked Builds (searchable): Colnago C59 - 5 Years Later; Trek Emonda SL Campagnolo SR; Special Colnago EPQ
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I like it. More subdued, but still some infuriating (to some) Italian flare. For some reason the fork reminds me of a thm scapula.
That's probably because Pinarello don't design bikes with the sole intention of passing the Tour deflection tests.
IIRC, The last Dogma had the stiffest BB area of the bikes tested in Le Cycle last year. Didn't win their bike of the year though.
IIRC, The last Dogma had the stiffest BB area of the bikes tested in Le Cycle last year. Didn't win their bike of the year though.
Le Cycle tests are somewhat subjective but much more sincere ΙΜΟ.
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uncommon to see threaded BB in new top model
Thanx God there is still one producer like that!
It is the only problem free solution. I love it!
I had few problems with press fit systems.....from the moment I have Dogma, I ride bike instead of solving problems with BB and I am happy
Kuddos to PINA!
It is the only problem free solution. I love it!
I had few problems with press fit systems.....from the moment I have Dogma, I ride bike instead of solving problems with BB and I am happy
Kuddos to PINA!
Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓ Broad Selection ✓ Worldwide Delivery ✓
www.starbike.com