'Dale Posted May 27, 2016 Share Has anyone know why I'd be putting out more power on my road bike VS my mountain bike? I used both on the road and there is probably a 40-50watt difference in power. I'm not sure if anyone has answered this in the 20 000 previous comment That's a big gap I run power on both my bikesThe variable terrain affects my pedal stroke which renders different numbers Could that be it? Link to comment Share on other sites More sharing options...
Slakkepas Posted May 27, 2016 Share Has anyone know why I'd be putting out more power on my road bike VS my mountain bike? I used both on the road and there is probably a 40-50watt difference in power. I'm not sure if anyone has answered this in the 20 000 previous comment Power output over different brands differ. I have vectors of roadbike and stages on mtb and its not the same. I also differ outside on the bike and on the idt Edited May 27, 2016 by Slakkepas Link to comment Share on other sites More sharing options...
Eon du Plessis Posted May 27, 2016 Share Power output over different brands differ. I have vectors of roadbike and stages on mtb and its not the same. I also differ outside on the bike and on the idt The differences should be a few percentage points though, nothing as large as 50W. Link to comment Share on other sites More sharing options...
'Dale Posted May 27, 2016 Share The differences should be a few percentage points though, nothing as large as 50W.Definitely ???????????????????????? Link to comment Share on other sites More sharing options...
Vetplant Posted May 27, 2016 Share Has anyone know why I'd be putting out more power on my road bike VS my mountain bike? I used both on the road and there is probably a 40-50watt difference in power. I'm not sure if anyone has answered this in the 20 000 previous comment Where on the drive train are your power meters installed? Are you using the same sensor and moving it between the two bikes? If you are using different crank lengths and not adjusting for that you could see big differences.. Link to comment Share on other sites More sharing options...
Slakkepas Posted May 27, 2016 Share The differences should be a few percentage points though, nothing as large as 50W.I use my road bike (vector pedals) on my tacx genius, so have the power from both. Running them simultaneously the power difference is 10%. But yea 50w is a lot. Link to comment Share on other sites More sharing options...
Eon du Plessis Posted May 27, 2016 Share I use my road bike (vector pedals) on my tacx genius, so have the power from both. Running them simultaneously the power difference is 10%. But yea 50w is a lot.Look that I can understand. The trainer measures at the wheel, so whatever losses you have through your drive train, won't be taken into account. Feathering the brakes while pedalling will have the trainer show you a way lower power reading than the pedals. The pedals are probably the more correct of the two, if I had to guess. Link to comment Share on other sites More sharing options...
Saudiq Posted May 27, 2016 Share I’ve been switching my stages PM between my road and mountain bike (and yes, I know the Q-factor is out by 4mm but with one leg 2cm longer than the other and number of other factors, this really hasn’t bothered me at and all both cranks are 175mm) I’ve only been riding my MTB since the Argus and when I did threshold training 2 weeks ago I struggled to maintain 250w. When I jumped on my road bike this week I managed 2 intervals at 300 – 310w which was hard but very manageable. My peak in November was 350w for 20min interval. Link to comment Share on other sites More sharing options...
Slakkepas Posted May 27, 2016 Share Look that I can understand. The trainer measures at the wheel, so whatever losses you have through your drive train, won't be taken into account. Feathering the brakes while pedalling will have the trainer show you a way lower power reading than the pedals.The pedals are probably the more correct of the two, if I had to guess.The trainers reading is 10% higher than the pedals. think the software is the key factor in the differences shown. Actual can have many factors Edited May 27, 2016 by Slakkepas Link to comment Share on other sites More sharing options...
Eon du Plessis Posted May 27, 2016 Share The trainers reading is 10% higher than the pedals. think the software is the key factor in the differences shown. Actual can have many factorsI assume everything is calibrated? Link to comment Share on other sites More sharing options...
Slakkepas Posted May 27, 2016 Share I assume everything is calibrated?before every ride Link to comment Share on other sites More sharing options...
jcza Posted May 27, 2016 Share I’ve been switching my stages PM between my road and mountain bike (and yes, I know the Q-factor is out by 4mm but with one leg 2cm longer than the other and number of other factors, this really hasn’t bothered me at and all both cranks are 175mm) I’ve only been riding my MTB since the Argus and when I did threshold training 2 weeks ago I struggled to maintain 250w. When I jumped on my road bike this week I managed 2 intervals at 300 – 310w which was hard but very manageable. My peak in November was 350w for 20min interval. Sounds very strange, lost 100W? Link to comment Share on other sites More sharing options...
usxorf Posted May 27, 2016 Share I’ve been switching my stages PM between my road and mountain bike (and yes, I know the Q-factor is out by 4mm but with one leg 2cm longer than the other and number of other factors, this really hasn’t bothered me at and all both cranks are 175mm) I’ve only been riding my MTB since the Argus and when I did threshold training 2 weeks ago I struggled to maintain 250w. When I jumped on my road bike this week I managed 2 intervals at 300 – 310w which was hard but very manageable. My peak in November was 350w for 20min interval. Fatigue maybe? Did you test on the same stretch of road? Unless you have some serious fit issue on mtb compared to road. I have power on road and mtb and the numbers are very similar depending on terrain. As an aside, spinscan showed a discrepency of 65-35 or more at low cadence for me (49/51 at 95-100rpm). Stages being one-sided and road usually at 95rpm vs 75rpm on mtb, might just be a reading error. Borrow someone's powertap for your mtb if you can. Edited May 27, 2016 by usxorf Link to comment Share on other sites More sharing options...
'Dale Posted May 27, 2016 Share Sounds very strange, lost 100W?Very strange indeedMystery Link to comment Share on other sites More sharing options...
V12man Posted May 27, 2016 Share I’ve been switching my stages PM between my road and mountain bike (and yes, I know the Q-factor is out by 4mm but with one leg 2cm longer than the other and number of other factors, this really hasn’t bothered me at and all both cranks are 175mm) I’ve only been riding my MTB since the Argus and when I did threshold training 2 weeks ago I struggled to maintain 250w. When I jumped on my road bike this week I managed 2 intervals at 300 – 310w which was hard but very manageable. My peak in November was 350w for 20min interval. Are you recalibrating the stages each time you move it? Link to comment Share on other sites More sharing options...
Saudiq Posted May 27, 2016 Share Fatigue maybe? Did you test on the same stretch of road? Unless you have some serious fit issue on mtb compared to road. I have power on road and mtb and the numbers are very similar depending on terrain. As an aside, spinscan showed a discrepency of 65-35 or more at low cadence for me (49/51 at 95-100rpm). Stages being one-sided and road usually at 95rpm vs 75rpm on mtb, might just be a reading error. Borrow someone's powertap for your mtb if you can. No, I also used heart rate variability to check how fatigued I am and it was pretty similar. Yes, same stretch of road as well. Could this possibly be due to my MTB setup? I've checked saddle height and used plum bomb to check fore-aft and seems right Link to comment Share on other sites More sharing options...
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