Dura-Ace R9200

[Ritxis]

@Alfus returns
looking at the front mech it looks to have shrunk or not ?

FD or........ big chainring??

Or wheel

with logo? .......no creo

[robbosmans]

Seems like regular old 9150 to me

[RDY]

Seems like regular old 9150 to me

^

[Ritxis]

Well, if you see something different from the R9150............

R0150



New??


the case is not the same

[robbosmans]

You are not looking good enough, there is a reflection on the top of the derailleur that makes it seem like it is smaller but it isnt

[Ritxis]

despite glare and reflections, the shape of the case is not the same... The "doubtful" is more rectangular

[slake21]

square is not very aero
to me it actually looks bigger than the old one.

[Lord Vader]

Tbh, I'd bet that this is the current DA front derailleur, it just looks different due to weird reflections.

[tjvirden]

I'm not an engineer but AFAIK wider automobile often has smaller aero drag (Cd) than narrower one. Somehow smaller frontal area does not translate to small drag directly.

Cd doens't take into account the area, you're looking for CdA (A being area)

A wider automobile can certainly have a smaller Cd than a narrower one; Cd represents shape with respect to "airflow" from a particular direction - automobiles are generally designed with a much smaller range of airflow directions in mind ('yaw') than bicycles experience, so a low Cd with head on airflow can turn into a much higher Cd with a small change in airflow direction - and the A increases too as the direction changes.....

[tjvirden]

Dura Ace AX 7300 was Shimano's first "aero" groupset wasn't it?.......in 1980......

[LainOTN]

Dura Ace AX 7300 was Shimano's first "aero" groupset wasn't it?.......in 1980......

Yup.

[TobinHatesYou]

despite glare and reflections, the shape of the case is not the same... The "doubtful" is more rectangular

It's the same case. You are letting the differing reflections in both photos trick your brain.

Like I said a page ago, I'd rather discuss Shimano's business practices than have to repeatedly debunk blurry photos where people only see what they want to see.

[spartan]

if this is a red herring why did alfus post ?

alfus stirring up sh***

[TobinHatesYou]

if this is a red herring why did alfus post ?

alfus stirring up sh***

alfus does not and has never worked for Shimano.

[cyclespeed]

Tri guys have shown a 2w difference going from 2x to 1x. So there's gains to be made with the FD.

Aero rotors, maybe solid rotors for TT as you aren't braking very much?

Smaller disc calipers or ones that are more blended with the fork might make sense for TT.

If, by removing the FD entirely (plus any cables), and also the small chainring saves 2W, (which sounds reasonable), then just changing the shape of the 9150 FD would save maybe 0.01W......