Cassette ratios
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Cassette ratios
Postby xmpt » Fri May 10, 2013 9:44 pm
I hope this is in the correct section as I am new to BNA but does anyone know if the ultegra 12-30 cassette will work with an ultegra Di2 rear derailleur? The reason I am asking is I need some extra gear assistance since a cycling accident where I ruptured all the ligaments in my knee.
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Re: Cassette ratios
Postby Jesmol » Sat May 11, 2013 7:07 am
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Re: Cassette ratios
Postby ozzymac » Sat May 11, 2013 7:51 am
I am in the process of doing the same thing, and going by what I have read the 12/30 works fine with di2.
Thats what I am ordering with the new chain so it better work.
Cheers
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Re: Cassette ratios
Postby Jesmol » Sat May 11, 2013 2:15 pm
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Re: Cassette ratios
Postby xmpt » Sun May 12, 2013 4:50 pm
thanks for that. I hope it works for you. Please let me know either way.ozzymac wrote:Hi,
I am in the process of doing the same thing, and going by what I have read the 12/30 works fine with di2.
Thats what I am ordering with the new chain so it better work.
Cheers
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ta Carl
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Re: Cassette ratios
Postby ozzymac » Sun May 12, 2013 7:10 pm
Hi,Jesmol wrote:I'd check first with the shimano documents, Wiggles desc states 28t , and the di2 came out before the 6700a rd which is 30t capable
I was going by some reviews of people who have bought the 30 cassette via wiggle. They reckon it works fine with di2.
Cheers
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Re: Cassette ratios
Postby Jesmol » Mon May 13, 2013 10:28 am
Also Chain wrap may be a problem, Running compact (50-34 with a 12-30 cassette) gives you a total chain wrap of 34T, capacity of the 6770 RD is 33T
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Re: Cassette ratios
Postby xmpt » Mon May 13, 2013 10:14 pm
At the moment I have the 54-39 front. The reason I am looking at rear ratios is so I dont have to change the front.Jesmol wrote:Shimano also state a max rear sprocket of 28T, just be aware that you're operating outside their design parameters, therefore expect no warranty if something goes pear shaped.
Also Chain wrap may be a problem, Running compact (50-34 with a 12-30 cassette) gives you a total chain wrap of 34T, capacity of the 6770 RD is 33T
My problem is I tore my PCL (full), ACL (50%), multiple tares to the meniscus and cracked the ACL mounting horn all due to a pedestrian steeping in front of me at 52km/h in Jan this year. Anyway what this means is as soon as I hit a hill and start to load the knee I end up in lots of pain and with a very swollen knee.
Really grateful for all of the advice
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Re: Cassette ratios
Postby Jesmol » Tue May 14, 2013 9:24 am
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Re: Cassette ratios
Postby theprophet » Thu May 16, 2013 6:37 pm
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Re: Cassette ratios
Postby Crawf » Fri May 17, 2013 8:38 am
Less faffing about switching the front and the fact that Di2 laps up cross-chaining without issue is a win-win for me. Never had one issue and no signs of premature wear or strain on the drivetrain.
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Re: Cassette ratios
Postby optiumcarbon » Fri May 17, 2013 5:15 pm
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Re: Cassette ratios
Postby Xplora » Fri May 17, 2013 5:38 pm
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Re: Cassette ratios
Postby MREJ » Fri May 17, 2013 6:28 pm
I tried it once on the work stand and it stretched the chain out and jammed. A nervous moment there.
I did ask the shop why we couldn't just run a longer chain; there was a reason, but I don't remember it.
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Re: Cassette ratios
Postby im_no_pro » Sat May 18, 2013 12:50 am
Most likely too much slack for the derailleur to handle at the other end of the spectrum.MREJ wrote:
I did ask the shop why we couldn't just run a longer chain; there was a reason, but I don't remember it.
master6 wrote: Moderators are like Club Handicappers; I often think they are wrong, but I dont want the job.
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Re: Cassette ratios
Postby RonK » Sat May 18, 2013 4:51 pm
Yes, the chain may well rub on the derailleur when on small-small.im_no_pro wrote:Most likely too much slack for the derailleur to handle at the other end of the spectrum.MREJ wrote:
I did ask the shop why we couldn't just run a longer chain; there was a reason, but I don't remember it.
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Re: Cassette ratios
Postby GasCyclist » Mon May 27, 2013 12:45 pm
What I mean is, one wheel has a 12-25 for normal bunch rides and another wheel has the 12-30 for when I decide to go on a nice climbing ride. I currently ride a standard crank.
Cheers
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Re: Cassette ratios
Postby Jesmol » Mon May 27, 2013 3:09 pm
The only issue I have when swapping wheels is slight variances in the hub / cassette positioning can get the shifter indexing slightly out of whack.GasCyclist wrote:I have a different question regarding this. If I purchase the new Ultegra 6700A derailleur is it possible to swap from 12-25 to 12-30 without any dramas.
What I mean is, one wheel has a 12-25 for normal bunch rides and another wheel has the 12-30 for when I decide to go on a nice climbing ride. I currently ride a standard crank.
Cheers
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Re: Cassette ratios
Postby toolonglegs » Mon May 27, 2013 3:38 pm
Last year I ran 9 speed 11/34 on my CX bike with a 38/46 and a XTR rear mech which worked well. But I want a 10 speed set up for my non mud bike, want to try running a 12/30 on a 34/50 crank... think I might get a medium cage derailleur though?.
Main reason is lots of climbing coming up over the next 6 weeks... but most of it will be at the tail end of tours looking after people... which means 4kmph for long periods sometimes...would like to look after my knees!. But this year I won't be offering to push people the entire way up Grand Cols!.
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Re: Cassette ratios
Postby GasCyclist » Mon May 27, 2013 3:41 pm
Is this swapping between the 12-25 and 12-30?The only issue I have when swapping wheels is slight variances in the hub / cassette positioning can get the shifter indexing slightly out of whack.
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Re: Cassette ratios
Postby Jesmol » Mon May 27, 2013 4:11 pm
12-27 (in the training wheel) and 11-28 on the road wheel. In the end I got sick of having to tweak the shifting everytime I swapped wheels, and just train on my road tyres now.GasCyclist wrote:Is this swapping between the 12-25 and 12-30?The only issue I have when swapping wheels is slight variances in the hub / cassette positioning can get the shifter indexing slightly out of whack.
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Re: Cassette ratios
Postby toolonglegs » Mon May 27, 2013 4:16 pm
If you are using two different types of wheels with the cassettes fitted it could mean you need to adjust the high/lows on the derailleur each time you change... the same can be said for different types of cassettes. A 105 cassette can sit slightly different to an Ultegra one meaning an adjustment each time. But sometimes nothing needs adjusting.GasCyclist wrote:Is this swapping between the 12-25 and 12-30?The only issue I have when swapping wheels is slight variances in the hub / cassette positioning can get the shifter indexing slightly out of whack.
Also if doing this you may want to be on reasonably new chain and cassettes. As an old chain will slip on a new cassette. Ideal would be a matched pair, ie swapping chain and cassette as a pair... especially if you run one cassette much more often than the other.
The last thing would be chain tension... check your chain is long enough for the 30 tooth etc.
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Re: Cassette ratios
Postby GasCyclist » Mon May 27, 2013 4:38 pm
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Re: Cassette ratios
Postby Jesmol » Mon May 27, 2013 4:53 pm
Worst case may need the derailleur stop adjusting screws.GasCyclist wrote:High Low as in the Barrel Adjuster?
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