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Post by r0b1et on Jul 15, 2015 11:15:20 GMT
Several of my club TTers do 12hr TTs on TT bikes. 279km is mad to me, 40km is hard enough.
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Post by goffski on Jul 15, 2015 11:20:07 GMT
Several of my club TTers do 12hr TTs on TT bikes. 279km is mad to me, 40km is hard enough. Yeah, a mate of mine is now doing 50 mile TT's. A few guys in his club to 12 and 24hr TT's. Crazy! Sorry, going slightly off topic.
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Post by r0b1et on Jul 15, 2015 11:27:50 GMT
Some serious advice to Rocket - you can do a pretty good job of reducing your CdA by messing on a turbo and a long mirror, or a tripod mounted camera (so it stays still). Set up so the mirror/camera are directly in front of you, and then just reduce the area you cover... it's not 100% accurate as angles make a difference, but plain frontal area is the dominant factor. I've spent a while doing this, and testing if my power is dropping on 5 minute efforts (if I go 1cm further out, I lose power notably)... but that will tell you a lot, and how much getting narrow and shrugging those shoulders makes. Also worth "Turtling" (holding the neck down but head up), though it's not comfy for long, I try to do that into the wind though.
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Post by denkfaul on Jul 15, 2015 11:30:21 GMT
I agree with r0b1et here, the difference the clip-ons make to your profile width does matter more than your height. Anecdotal evidence posed as fact: I used clip-ons for the first time on my last TT a couple weeks ago and added 1.5km/h over my previous best, on a night with strong unfavourable winds. I dropped my stem as the clip-ons sit above the bars but looking at photos from this and previous events, I don't appear to be any lower while on the clip-ons. I've experimented with different positions and grips over the last 7 events, but simply adding clip-ons gave me the biggest boost by far.
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Deleted
Deleted Member
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Post by Deleted on Jul 15, 2015 11:37:13 GMT
Try the Michael Hutchinson method. He used to take head on photo's of his riding position, print them off, cut out himself then weighed the pieces of paper to see which riding position was lightest (therefore smallest frontal area).
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Post by r0b1et on Jul 15, 2015 11:40:54 GMT
Try the Michael Hutchinson method. He used to take head on photo's of his riding position, print them off, cut out himself then weighed the pieces of paper to see which riding position was lightest (therefore smallest frontal area). Yep... that's the way to operate the tripod camera method. I have been thinking about writing a CaD improver python script to analyse a front on photo and give a frontal area measurement. Shouldn't be too hard to achieve.
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Post by goffski on Jul 15, 2015 11:40:55 GMT
looking at photos from this and previous events, I don't appear to be any lower while on the clip-ons. My point was with Roy's setup he's noticeably higher on the bars than he is on the drops. If he drops the step its not going to be a great everyday ride. I know clip on's do make a difference as i spent a long time last year on them doing what Roys doing and trying to get more aero, so far not bothered this year with them. (by the way i don't TT).
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ray1
Peloton Rider
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Post by ray1 on Jul 15, 2015 15:53:43 GMT
When you are on the clip on you seem to stretch out. Might have to move you seat and fit a sorter stem. I’ve also just fitted clip on. Had to move my saddle all the forward and raise it a bit. Also fit a sorter stem to get me more aero. Since I’ve done the adjustments Have found and bit more speed and I would say more power.
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Post by r0b1et on Jul 15, 2015 21:39:15 GMT
When you are on the clip on you seem to stretch out. Might have to move you seat and fit a sorter stem. I’ve also just fitted clip on. Had to move my saddle all the forward and raise it a bit. Also fit a sorter stem to get me more aero. Since I’ve done the adjustments Have found and bit more speed and I would say more power. stretching as good as long as it doesn't kill power, keeps you flatter. But shifting saddle forward and up will likely help power in the tt tuck.
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ray1
Peloton Rider
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Post by ray1 on Jul 16, 2015 9:25:07 GMT
When you are on the clip on you seem to stretch out. Might have to move you seat and fit a sorter stem. I’ve also just fitted clip on. Had to move my saddle all the forward and raise it a bit. Also fit a sorter stem to get me more aero. Since I’ve done the adjustments Have found and bit more speed and I would say more power. stretching as good as long as it doesn't kill power, keeps you flatter. But shifting saddle forward and up will likely help power in the tt tuck. That what I found when I move my saddle forward and up . The power and I find I can spin faster. Since fitting the clip on, have got a lot of Pb and avg has going up a bit.
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Post by Rocket on Jul 16, 2015 19:31:58 GMT
Perhaps I should clarify my aims. I wish to make myself as aerodynamic as I can for general riding on normal bars. I spend a lot of time at high speeds either solo or in a pack. I'm not the most powerful out there but I'm not miles off the others so just need a bit of help.
The tri bars will only be fitted for any attempts I make at TT's. I think it is dangerous to ride on these in a pack as you are so far from the brakes unless it's a multi-rider TT of course.
So I'm happy where I'm at for normal bars and will yank all the spacers and the clamp out to slam the stem when using tri bars.
Think it's time I invested in a more aero helmet than my £10 Lidl ones. Specific TT one perhaps along with something for normal road uses so any suggestions please?
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Deleted
Deleted Member
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Post by Deleted on Jul 16, 2015 19:37:43 GMT
Perhaps I should clarify my aims. I wish to make myself as aerodynamic as I can for general riding on normal bars. I spend a lot of time at high speeds either solo or in a pack. I'm not the most powerful out there but I'm not miles off the others so just need a bit of help. The tri bars will only be fitted for any attempts I make at TT's. I think it is dangerous to ride on these in a pack as you are so far from the brakes unless it's a multi-rider TT of course. So I'm happy where I'm at for normal bars and will yank all the spacers and the clamp out to slam the stem when using tri bars. Think it's time I invested in a more aero helmet than my £10 Lidl ones. Specific TT one perhaps along with something for normal road uses so any suggestions please? www.bikeradar.com/road/gear/article/best-aero-road-helmets-tunnel-and-road-tested-44719/
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Post by ChrisD on Jul 16, 2015 19:53:24 GMT
Marginal gains everywhere but in the price tag it seems. I appreciate R&D costs need to be covered but I still really struggle to understand how an item that is largely fashioned from polyfoam can be so expensive. I upgraded from my Lidl lid a couple of weeks ago to a Giro Foray (black and red of course) bought from Halfords with an online discount code and BC discount on top (from the Bargain thread) for just over £30 and that'll be my headwear extravagance for this season.
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