Buy the whole cassette. In theory the individual sprockets (or pinned sets for the first few) are available for the better level cassettes, but you'll have a hard time actually finding them.BugsBunny wrote:Thx Duck.
Do you need to buy the 11-32 cassette as a full unit or is it possible to just replace the 28 with the 32 cog individually?
Ultegra 6870 11-28 vs 11-32 cassette experience
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby Duck! » Wed Jun 24, 2015 7:02 pm
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby queequeg » Wed Jun 24, 2015 11:04 pm
My gut feeling is that I will only need the 28 cassette as a bailout. The 11-28 cassette swaps the 16 for the 28 but it otherwise identical to my current cassette.
If I go long cage I can get the 11-32 cassette that keeps the 16 and looks like 11-12-13-14-16-18-20-22-25-28-32
So, you get fairly evenly spaced climbing hears, but still only get a huge jump to the bailout gear.
I am going to hopefully do a test run in late August/early September on the worst of the hills using my 11-25. If I can do that, I'll throw on the 11-28 to give me a bailout gear for the actual event. If I find I am suffering then I'll get the long cage and go all in, but I can't see any need to change to a full compact crank as 36 vs 34 is close enough for me. I have managed 6 Gorges + Peats Ridge (210km with 4,000m) on 39/28 on a steel bike, so 36/28 on a bike weighing 4kg less should be ok.
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby singlespeedscott » Thu Jun 25, 2015 12:11 am
I would seriously think about going the 28 tooth option. At the fitz you wont be going super hard, even in a group, so that 16 tooth will be unnecessary. Later in the ride you will be facing the climbs up Apollo and Corrin roads and the 28 will be nice for your weary legs.
The other bonus is that your 25 will now be easily accesible for use with the 52. This will be nice for the rolling undulations on your way to Fitz's hill.
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby kb » Thu Jun 25, 2015 7:03 am
I agree with SSS . Depends on what you're after though. Completing would be a non-issue but sub-10 might take a bit of work. 34-28 was ok even for a weakling like me (3.3W/kg).jasonc wrote:one sub-9 minute effort does not a 3 peaks makesinglespeedscott wrote:Given your recent effort up Cootha I think you'll be fine.
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby queequeg » Thu Jun 25, 2015 7:14 am
4kg might not sound that much, but would you carry an extra 4l bottle of water on your back up any of those climbs?singlespeedscott wrote:4kg in the grand scheme of total weight is going to make naff all difference.
I would seriously think about going the 28 tooth option. At the fitz you wont be going super hard, even in a group, so that 16 tooth will be unnecessary. Later in the ride you will be facing the climbs up Apollo and Corrin roads and the 28 will be nice for your weary legs.
The other bonus is that your 25 will now be easily accesible for use with the 52. This will be nice for the rolling undulations on your way to Fitz's hill.
I am definitely thinking that even without doing the climbs beforehand, the 28 will be handy. I think the RD may have enough capacity that once I get a new chain for the 28 cassette, I should be able to keep that chain when swapping back to the 25 for racing.
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby jasonc » Thu Jun 25, 2015 7:32 am
I've done all my long rides in the last 12 months with 52/36 + 11/28. For 3 peaks, I have a compact crank ready to put on so that'll give me a low gear of 34/28queequeg wrote:I have managed 6 Gorges + Peats Ridge (210km with 4,000m) on 39/28 on a steel bike, so 36/28 on a bike weighing 4kg less should be ok.
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby queequeg » Thu Jun 25, 2015 7:55 am
I think I would just swap the RD out to go lower than 36/28 and keep my cranks the same.jasonc wrote:I've done all my long rides in the last 12 months with 52/36 + 11/28. For 3 peaks, I have a compact crank ready to put on so that'll give me a low gear of 34/28queequeg wrote:I have managed 6 Gorges + Peats Ridge (210km with 4,000m) on 39/28 on a steel bike, so 36/28 on a bike weighing 4kg less should be ok.
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby jasonc » Thu Jun 25, 2015 8:26 am
so either way you need a new chain, we'll exclude that from change price. all prices are from ribblequeequeg wrote:I think I would just swap the RD out to go lower than 36/28 and keep my cranks the same.jasonc wrote:I've done all my long rides in the last 12 months with 52/36 + 11/28. For 3 peaks, I have a compact crank ready to put on so that'll give me a low gear of 34/28queequeg wrote:I have managed 6 Gorges + Peats Ridge (210km with 4,000m) on 39/28 on a steel bike, so 36/28 on a bike weighing 4kg less should be ok.
6870 GS rear derailleur - $185
11-32 cassette - $62
vs
6800 50/34 crank $192
that puts me $50 ahead.
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby queequeg » Thu Jun 25, 2015 8:37 am
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby Duck! » Thu Jun 25, 2015 9:03 am
As I said earlier, you may not need to change the derailleur. It does depend a bit on chainstay length, but it is entirely possible to use the big cassette with a standard derailleur.queequeg wrote:I've just been looking at options for Fitz 210. My S5 has 11-25 with a 52/36 crank. I can go up to a 28 with the current short cage dérailleur, or I can switch the RD to long cage and go up to a 32.
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby jasonc » Thu Jun 25, 2015 9:13 am
i did betterer - my brother sold my his compact for $25queequeg wrote:I only have a mech groupset, and the 6800 long cage is $69
and nothing is wrong with "only" mechanical
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby vosadrian » Thu Jun 25, 2015 10:49 am
Cheers,
Adrian
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby queequeg » Thu Jun 25, 2015 1:01 pm
really, I thought it was a matter of how much slack the rear dérailleur can take up?Duck! wrote:As I said earlier, you may not need to change the derailleur. It does depend a bit on chainstay length, but it is entirely possible to use the big cassette with a standard derailleur.queequeg wrote:I've just been looking at options for Fitz 210. My S5 has 11-25 with a 52/36 crank. I can go up to a 28 with the current short cage dérailleur, or I can switch the RD to long cage and go up to a 32.
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby Duck! » Thu Jun 25, 2015 1:55 pm
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby singlespeedscott » Thu Jun 25, 2015 4:54 pm
If you have the correct capacity rear derailleur for your drive train your chain length will be perfect.
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Re: Ultegra 6870 11-28 vs 11-32 cassette experience
Postby Duck! » Thu Jun 25, 2015 7:12 pm
If I'm pushing the (sometimes conservative) specifications of a derailler's capacity, I will mark the link I intend to cut the chain at (a loosely-fitted small cable tie around the roller is good), flick up to big:big & check again that it's going to work before committing to cutting the chain. In a departure from the conventional big:big method, I keep the chain through the derailleur while doing this so I can actually see if it has enough range. (Diversion alert!) This becomes reasonably important on dual suspension MTBs. Most modern rear suspension systems actually increase the effective chainstay length to some extent through the range of travel, so it's important to allow for that when setting chain length.
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