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Old 10-03-10, 10:30 AM   #1
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Help with new group: Shimano 105 5700 Triple contra Shim. Ultegra Triple Sl

For my new frame I want a new group, Triple; I found thes groups for the same price (about), only drawback is that the Ultegra comes with 172.5 cranks as where I can get the 105 with 175. Is this a big difference? I'm 181 cm.

Big difference in quality & durability with normal use?

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Old 10-03-10, 11:07 AM   #2
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I have 172.5 on my road bikes and 175 on my mountain bike. After 10 seconds I don't notice any difference. Quality and durability shouldn't change between crank lengths.
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Old 10-03-10, 11:38 AM   #3
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Let's see...181cm makes you about 3'5", right? Ok...maybe 5'11"

I'm 6'2" (188cm) and run 175cm crank arms. My guess is that you could run either without really noticing.

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Old 10-03-10, 01:08 PM   #4
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Ok that helps!

What about quality difference on the groups? Any?
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Old 10-03-10, 02:24 PM   #5
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The 5700 105 will have shift cables hidden under the bar wrap, the Ultegra SL - if it's the 6600 model - will have the shift cables out in the open. Not sure which one's lighter, and if one is it's not by much. Other than that, you shouldn't be able to fell much if any quality difference between the two, although the Ultegra is nominally higher quality.

I'm not sure if there's a difference in hood shape, so that might be a big difference though.

FWIW, if you want to have matching Shimano pedals the 5700 pedals will probably be cheaper and pretty much identical except for finish.
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Old 10-04-10, 09:20 AM   #6
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Differences between 5703 (new 105 triple) and 6604 (Ultegra SL triple) groupsets:

The large chainring on the 6604 has 52 teeth, the large ring on the 5703 has a 50-tooth big ring. Therefore, the 6604 will allow you to travel 4% faster (about half a gear on the rear) for a given cadence. The shape of the front derailleurs for each group also differ to allow for this difference.

The 6604 group is lighter than the 5703 group. I'm not sure by how much, I'd guess by about 200 grams total, maybe less.

As mentioned above, the 5703 levers allow you to route the derailluer cables under the bar tape, whereas with the 6604 the cables stick out the inside of the lever. Many people prefer the look of the under-the-tape routing, other people don't care.

The 6604 will allow you to downshift 3 gears on the back with one sweep of the lever, the 5703 will only allow 2 gears at a time.

The 5703 levers are designed with the new brake cable pull ratio, so work best with Shimano 5700, 6700, or 7900 brakes (although they do work OK with other brakes, there is a noticeable difference). The 6604 levers use a normal pull ratio and so work fine with almost any road brakes.

If I was choosing myself, I think I'd go for 6604 (Ultegra SL), but I can see advantages of each, and I'm not surprised they are a similar cost.
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Old 10-04-10, 04:37 PM   #7
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If it was just the difference between 105 & Ultegra taking into account the crank length, I'd go with the Ultegra for the smoother shifting. To me, the crank length doesn't matter and most riders don't spin fast enough to use the smallest cogs on the cassette to go at the speed the smallest cogs will get you. With that in mind, the 50 would be better than the 52.
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Old 10-17-10, 01:44 PM   #8
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Well I went for the Ultegra so... Excited to see/ feel how it works! Long winter here in Norway so plenty of time to assemble ;-)
Thanks for the help!
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