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 Post subject: Bootie or no Bootie(s)
PostPosted: Tue May 27, 2014 9:49 pm 
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Joined: Wed Oct 30, 2013 12:52 am
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Opinions on when to wear them for TTs.
Who has the lightest ones?

Shoes are getting slicker. They do weigh something.

I'm not sold on sub-30mph/50kph TTs needing them. Especially in the case of juniors that are typically spinning faster.


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PostPosted: Wed May 28, 2014 2:52 am 
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Location: Santa Cruz, California, USA
I only do uphill TTs so I am no aero weenie. But I'd use them for flat TTs even at mid 20 mph speeds.
At the top of the pedal stroke the foot is moving forward relative to the bike. So the feet are going significantly faster than the rest of the bike and rider.

Which BTW is why your feet get cold so easily in the winter: increased heat loss via convection.

I think the numbers are in Cycling Science but can't find my copy right now.


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Posted: Wed May 28, 2014 2:52 am 


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PostPosted: Wed May 28, 2014 4:31 am 
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There are some tests that show a detriment to booties that are not windproof.

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PostPosted: Wed May 28, 2014 2:18 pm 
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WMW wrote:
There are some tests that show a detriment to booties that are not windproof.


That is why I bought up a number of pairs of the previous model of Pearl Izumi Barrier Lite shoe covers (previous model had a rear 3/4 zip). :wink:

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PostPosted: Wed May 28, 2014 7:13 pm 
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I'm guessing you like PIs? Are the velcro ones no good?

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PostPosted: Thu May 29, 2014 12:11 pm 
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The PI's have tested well for me and others in the wind tunnel... Not sure of the current closing method, but after the zippered model they went for a slip on which was more likely stretch and become loose over time unlike the zippered version.

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PostPosted: Fri May 30, 2014 8:07 pm 
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Since booties are prone to not being wind proof, you're wearing them for a specific limited time event, and they limit your ability to adjust your shoes while you are riding and you won't adjust your shoes anyway in a TT, why not just wrap your shoes in some clear packing tape? Guaranteed wind-friendly, waterproof, temporary. People tape their helmet vents shut, do it for your shoes, save some cash.

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PostPosted: Sat May 31, 2014 4:46 am 
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Taping vents is definitely not UCI legal and pretty certain clear packing tape over shoes is either... Covers like the IP covers are windproof.

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PostPosted: Sat May 31, 2014 3:23 pm 
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I may pick up some of the PIs anyway, since places are selling them cheap. Some people complain about the ankles getting loose, but I have large ankles and calves. Plus I'm not shy about modifying pretty much everything.

What sort of benefit did you and others see in the wind tunnel?

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PostPosted: Sun Jun 01, 2014 6:46 am 
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Dalai wrote:
The PI's have tested well for me and others in the wind tunnel...


Do you have any sizing tips? Follow the recommendation or size up or down?

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PostPosted: Sun Jun 01, 2014 9:07 am 
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I wear size 42 Specialized shoes and size Large PI covers and find these nice and snug.

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PostPosted: Sun Jun 01, 2014 9:46 am 
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WMW wrote:
What sort of benefit did you and others see in the wind tunnel?


About 65G of drag or 0.75 second per kilometer.

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PostPosted: Sun Jun 01, 2014 10:38 am 
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If you have skinny lower legs, I do, the Pearl Izumi booties I bought fit too loose. I gave mine to a team mate. Wanted them to work but just did not fit right for me.

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PostPosted: Mon Jun 02, 2014 4:34 am 
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Dalai wrote:
I wear size 42 Specialized shoes and size Large PI covers and find these nice and snug.


Hmm... I was going to get L but they probably wouldn't fit on my size 44s.

I have large ankles and calves also. Might as well go big. I can get out the needle and thread if necessary.

.75 sec/km is a pretty huge speed improvement!

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Posted: Mon Jun 02, 2014 4:34 am 


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PostPosted: Mon Jun 02, 2014 8:16 am 
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I have skinny ankles and the zippered version has continued to be snug. Checked my stash last night - still have two more NOS pairs in the cupboard. :wink:

Noting the time savings, it actually now makes me feel a little better that my IP times hadn't improved recently. Since the UCI banned shoe covers indoors on the track I have had to find a extra 2.25' elsewhere over 3km to ride the same times as before...

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