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110BCD with less than 34T possible?
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Chrace




Joined: 28 Apr 2010
Posts: 2895
Location: Eating a Yorkie

PostPosted: Fri Mar 08, 2019 11:00 am    Post subject: Reply with quote

mattsurf wrote:
Chrace wrote:

Ace information Matt - many thanks!!

That might actually work and certainly worth a punt. My Di2 is set up for sequential shifting so the derailleur never gets near max extension anyway.

34x40 would be brilliant. Wonder if I need a longer chain, might do actually.

Mungo - it's the extreme X in May I'm worried about. 16 climbs above 20%, 6 of them hits 25%+ and 4 hits 33%. Total elevation around 5,000m and I need to save the legs for the fell marathon afterwards. Anything to get lower gears and spin up is worth it.


I saw the elevation, and it is impressive. I have a 34x36 on my gravel bike that I use for a local climb, there is one section at 23% for 1.5km which is manageable, but grinding, much easier on my XC Mountain bike with 32x40.

I've promptly ordered a Wolftooth Roadlink, an XT 11-40 cassette and a new chain. Smile

Can use the cassette and chain on my MTB anyway if it doesn't work - definitely worth a punt. Thanks!
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mattsurf




Joined: 28 Sep 2016
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Location: Zug, Switzerland

PostPosted: Fri Mar 08, 2019 1:17 pm    Post subject: Reply with quote

Chrace wrote:
mattsurf wrote:
Chrace wrote:

Ace information Matt - many thanks!!

That might actually work and certainly worth a punt. My Di2 is set up for sequential shifting so the derailleur never gets near max extension anyway.

34x40 would be brilliant. Wonder if I need a longer chain, might do actually.

Mungo - it's the extreme X in May I'm worried about. 16 climbs above 20%, 6 of them hits 25%+ and 4 hits 33%. Total elevation around 5,000m and I need to save the legs for the fell marathon afterwards. Anything to get lower gears and spin up is worth it.


I saw the elevation, and it is impressive. I have a 34x36 on my gravel bike that I use for a local climb, there is one section at 23% for 1.5km which is manageable, but grinding, much easier on my XC Mountain bike with 32x40.

I've promptly ordered a Wolftooth Roadlink, an XT 11-40 cassette and a new chain. Smile

Can use the cassette and chain on my MTB anyway if it doesn't work - definitely worth a punt. Thanks!


Let us know if it works well
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Mungo




Joined: 29 Sep 2016
Posts: 407
Location: Preston

PostPosted: Fri Mar 08, 2019 9:33 pm    Post subject: Reply with quote

Chrace..
Madness but well done all the same..

Iron distance...?

Cut offs??
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Chrace




Joined: 28 Apr 2010
Posts: 2895
Location: Eating a Yorkie

PostPosted: Mon Mar 11, 2019 12:47 pm    Post subject: Reply with quote

Mungo wrote:
Chrace..
Madness but well done all the same..

Iron distance...?

Cut offs??

2 hours for swim
11 hours for bike
11 hours for run

So, 24 hour total cut-off. It'll be very tight for me to get through bike and run.

Bike - did Bearman as a tester in September last year. It has same total bike height but lower gradients which should have made it slightly easier. Was 30-35C though so the long climbs really drained. Came it at 11 hour bike on that one.

Run - did a nighttime reccie in late November where we did half the run in 5.5 hours. Basically, not fast enough even from fresh start. Not a promising outlook for doing the full distance in 11 hours.

Oh, and madness is only not to try something new. Wink
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Chrace




Joined: 28 Apr 2010
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Location: Eating a Yorkie

PostPosted: Fri Mar 15, 2019 8:17 am    Post subject: Reply with quote

Well, it's on. It's shifting, but indexed like crap.

Compact front (P2M with SRAM red/force rings) and Ultegra Di2 medium cage rear on to an XT 11-40 rear giving me a 34x40 lowest.

Need to see if I can actually make it work now.
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mattsurf




Joined: 28 Sep 2016
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PostPosted: Mon Mar 18, 2019 9:16 am    Post subject: Reply with quote

Chrace wrote:
Well, it's on. It's shifting, but indexed like crap.

Compact front (P2M with SRAM red/force rings) and Ultegra Di2 medium cage rear on to an XT 11-40 rear giving me a 34x40 lowest.

Need to see if I can actually make it work now.


Have you checked hanger alignment, with such a big range this need to be set pretty well.

How does chain tension look in 34 - 11 combination?
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Chrace




Joined: 28 Apr 2010
Posts: 2895
Location: Eating a Yorkie

PostPosted: Mon Mar 18, 2019 1:37 pm    Post subject: Reply with quote

mattsurf wrote:
Chrace wrote:
Well, it's on. It's shifting, but indexed like crap.

Compact front (P2M with SRAM red/force rings) and Ultegra Di2 medium cage rear on to an XT 11-40 rear giving me a 34x40 lowest.

Need to see if I can actually make it work now.


Have you checked hanger alignment, with such a big range this need to be set pretty well.

How does chain tension look in 34 - 11 combination?

Not worried about 34-11, that's the same as before and would just end up with a slack chain at worst. The critical one would be 50-40 since that can break the rear mech. But since I use sequential shifting it never goes big-big. I can force it to do it but not sure it'd actually be possible so better leave it.

Haven't played around a lot yet. It's on the work stand in the garage at the moment so will probably give it a round tonight and see what I can do. Might need the new chain if stretch is too far but I'll see about that.
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Mungo




Joined: 29 Sep 2016
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PostPosted: Thu Mar 21, 2019 10:20 am    Post subject: Reply with quote

Chrace
I stand by my madness quote.

24 hour cut off...

Hope the gears work well i went from 34x30 to 34x23 on my normal route, same speed up Hunters, slow..., but HR 10-12 BPM higher which is key for Long Distance races.

Let us know how you get on, Epic race report...
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