"Rest" noted in the Josh Amberger interview thread that Josh and Tim increased their stack heigh for Kona this year.
Checking pictures, I noticed :
1) Tim Reed increased his stack height for Kona from Santa Rosa or Coeur d'Alene races
2) Josh Amberger increased his stack height also for Kona from Boulder race
Looking more precisely, the first photo I found of Josh TT bike with high stack is 23 august 2019, in Josh Facebook, after one week in Andorra.
Hmmm Andorra....(Cam Wurf leaves there)
Hmmm Tim Reed... (Cam Wurf buddy from Lord Howe Island)
Looking at Cam Wurf stack height :
2018 Roth : high stack
2018 Biomechanics study : high stack : https://www.triathlete.com/...s-top-cyclist_333693
2018 Wind Tunnel with new disk bike : ???
2018 Kona : LOW STACK
2018 Challenge Daytona : LOW STACK
2019 January training with Gearing Thomas in LA : BACK TO high stack
2019 Cannes : high stack
2019 Roth : high stack
2019 Italy : high stack with integrated cockpit on the new Kona bike
2019 Kona : high stack
So Cam Wurf tested lower stack, possibly from his pre-Kona 2018 wind tunnel. He used lower stack in Kona, Daytona, then for 2019 came back to higher stack.
These are facts... now let's go for some intuitions :
1) From 2018 pre-Kona wind tunnel, Cam Wurf tested several configs and choose a config "low stack" may be more aero, more adapted to optimizing bike leg.
2) He get Kona bike leg record.
3) For 2019, focusing on getting the run more efficient, he run much more (kind of doubling run volume) and come back to a more running friendly bike position - with or without aero penalty ?
4) he share his experience with Reed (his old buddy) and Amberger (during Andorra session), both choose also to increase their stack heigh
Side note 1 : increase stack heigh can bring aero penalty but facilitate power production, so little impact on bike leg ?
Side note 2 : increase stack heigh can help the run ?
Side note 3 : you might increase stack heigh, but not changing hip angle and back position, just "turtle" more, which improve aero especially if mantis position, as the head disappear more behind the hands ?
Is it possible increased stack help the run, facilitate bike power production, with no/little aero loss (if well studied) ?
Checking pictures, I noticed :
1) Tim Reed increased his stack height for Kona from Santa Rosa or Coeur d'Alene races
2) Josh Amberger increased his stack height also for Kona from Boulder race
Looking more precisely, the first photo I found of Josh TT bike with high stack is 23 august 2019, in Josh Facebook, after one week in Andorra.
Hmmm Andorra....(Cam Wurf leaves there)
Hmmm Tim Reed... (Cam Wurf buddy from Lord Howe Island)
Looking at Cam Wurf stack height :
2018 Roth : high stack
2018 Biomechanics study : high stack : https://www.triathlete.com/...s-top-cyclist_333693
2018 Wind Tunnel with new disk bike : ???
2018 Kona : LOW STACK
2018 Challenge Daytona : LOW STACK
2019 January training with Gearing Thomas in LA : BACK TO high stack
2019 Cannes : high stack
2019 Roth : high stack
2019 Italy : high stack with integrated cockpit on the new Kona bike
2019 Kona : high stack
So Cam Wurf tested lower stack, possibly from his pre-Kona 2018 wind tunnel. He used lower stack in Kona, Daytona, then for 2019 came back to higher stack.
These are facts... now let's go for some intuitions :
1) From 2018 pre-Kona wind tunnel, Cam Wurf tested several configs and choose a config "low stack" may be more aero, more adapted to optimizing bike leg.
2) He get Kona bike leg record.
3) For 2019, focusing on getting the run more efficient, he run much more (kind of doubling run volume) and come back to a more running friendly bike position - with or without aero penalty ?
4) he share his experience with Reed (his old buddy) and Amberger (during Andorra session), both choose also to increase their stack heigh
Side note 1 : increase stack heigh can bring aero penalty but facilitate power production, so little impact on bike leg ?
Side note 2 : increase stack heigh can help the run ?
Side note 3 : you might increase stack heigh, but not changing hip angle and back position, just "turtle" more, which improve aero especially if mantis position, as the head disappear more behind the hands ?
Is it possible increased stack help the run, facilitate bike power production, with no/little aero loss (if well studied) ?
Last edited by:
Pyrenean Wolf: Oct 30, 19 5:09