Agreeing with people who comment just how important watts are in cycling.

I used to race (never made it out of CAT 5 cause I suck on hills, though I’m a very strong sprinter but I hate crits). Even a few watts can make a difference. Its the difference between being dropped when someone attacks on a climb and being able to hang on and recover. Biking is the ‘Cold Equations’ (old Sci-fi story that illiustrates the cruel implacability of science) of sports. The standard unit of currency in cycling is Watts per Kilo, essentially, now many watts per kilo you can maintain at your FTP (Functional Power Threshold). If you look at a chart of cyclists from CAT-5 (the lowest racing category, all the way up to Grand Tour Contender (realistic chance of winning one of the big 3 races, Giro, TDF or Vuelta), it ranges from about 1.8- 2.0 for an untrained casual cyclist, 2.5 Watts/Kg for a CAT 5 to 6.7 Watts/Kg for Grand tour contenders (The Lance Armstrong’s, Alberto Contador, Cadel Evans). 6.7 is the magic number.
http://www.americanroadcycling.org/articles/PSL/WiddersHump/...

It is really hard to explain just how much different from you and I GC contenders are. I weight 70-75 Kg. At my fittest (down to 65 kg), I was probably putting out 3.5 watts per kilo (wasn’t racing at the time yet). You have 2 variables to play with, power, and weight. This is why pro cyclists are thin, and GC contenders cadaverously thin, especially before the big races. These guys weight 138 lbs (62 kilos) with an FTP of 420+. I’ve met Alberto Contador, I’m not a big guy (I’m 5,11), but next to him I seemed like a giant. I cannot even explain how insane their power figures are.
When you’re riding at the pro level, especially at the Grand Tours, everyone you are riding with is a genetic freak (this is why EPO will not turn Joe six pack into the next Lance Armstrong).

At my fittest, I once rode with a woman who’d come 3rd in the U.S Nationals. And she totally shredded me. She was out for an easy/medium ride, I was hanging on, seeing dots in my peripheral vision and feeling like I was about to puke my heart out. And this was the easy part of the ride on a flat. Once we got to a hill I was dropped like a hot potato. This is also why you don’t accept invitations from strangers at parties that start ‘Hey, your wife tells me you ride. My friends and i are going on a ride tomorrow. Wanna join us?'

Someone else posted about riding with a cyclist who rode the TDF and who never finished because he absolutely sucked at riding (this is true of a lot of cyclists whose goals is to support their GC contender at all costs even if it means destroying themselves and their chances). It was a hilly competitive ride with the local fast guys. And he dropped them on the first long climb, and he wasn’t even going hard. Being a TDF rider who sucks in the climbs > 99.9995 of cyclists. It’s all relative.

At that level, the gap between the winner and the also runs can come down to the smallest difference. Tyler Hamilton lost the Giro because he bonked on the final climb. He had an energy gel in his pocket, but forgot to eat, and by the time he did, it was too late. All it takes is a few watts so a motor that can even give a cyclist an extra 5-10 watts is huge. This is why cyclists wear skin suits and even go to ridiculous lengths (apparently, on a flat 40K TT, shaving your legs vs not can gain you 1-2 seconds). Bike innovations, especially for aerodynamic frames are measured in watts saved. This is also why there is a lower limit on the weight of bike frames in UCI races (about 15 lbs), because frame makers would be tempted to make even lighter bikes to the point of danger cause a few lbs when you are already at 3% body fat can make a difference (an aside, for most cyclists, weight frame is overrated. Saving 3 lbs on the frame is much more expensive than shaving 3 lbs off your weight, or even 20 lbs). My road bike weighs 16.5 lbs, I’d be better served by losing 40 lbs off my body.

Also, no one is going to use this motors for flashy efforts that are obvious. All you need is to save 20-30 watts on a long stage, and arrive at the base of a climb fresher than your competitors, and then use it again when needed on the climb.