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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: Wed Mar 06, 2019 1:35 pm    Post subject: 110BCD with less than 34T possible? Reply with quote

So, I'm hammering down my gearing in preparation for the extreme X in May.

I can't seem to find anything anywhere - is it possible to go sub-34T on the front in a normal 110BCD 5-bolt setup?

I've been looking at various CX chainrings but can't see to find anything.
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mattsurf




Joined: 28 Sep 2016
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Location: Zug, Switzerland

PostPosted: Wed Mar 06, 2019 1:40 pm    Post subject: Reply with quote

I looked at this last year, you can run a 33 tooth on 110 bcd, but couldn't find anything smaller

Best option is the cassette, you can run an 11-36 SRAM PG1170 cassette with the current R8000 Ultegra derailleur or with the older R5800 105 GS derailleur
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Jorgan




Joined: 12 Nov 2007
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PostPosted: Wed Mar 06, 2019 1:43 pm    Post subject: Reply with quote

Do you already have a 34T sprocket?
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Mungo




Joined: 29 Sep 2016
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PostPosted: Wed Mar 06, 2019 9:40 pm    Post subject: Reply with quote

Super compact.

48/32...?!

Praxis Gravel bike, people are getting them for IMUK...

FSA do one too for Adventure Bikes.

90BCD?

Im on 34x30 ...for now
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Chrace




Joined: 28 Apr 2010
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PostPosted: Wed Mar 06, 2019 10:43 pm    Post subject: Reply with quote

Hmm.. thought so. Been reading some more and it's basically not possible due to 110 being, well, 110. The circumference is not enough to go smaller than 33 which Praxis seems to make.

I'm on Di2 hence only possible to go 34 on the rear (new Di2 can do 34, old can't). And since I have a P2M with 110bcd and 5-bolt I was hoping not to have to change that.

For mechanical you can get the Wolftooth Lindarets adapter allowing road shifter (or at least Ultegra) and MTB rear mech. Then 34x42 is possible.

Not sure I can be bothered to go 33x34 from 34x34.
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Mungo




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PostPosted: Wed Mar 06, 2019 10:47 pm    Post subject: Reply with quote

Im #10speedtillidie!

Several wheelsets and love Sram red and my original di2 is still going strong....

How much elevation in your race?

The jump from 34x28 to 34x30 made a big difference on steep climbs, that and a very light bike i guess.

Nice buy on Flea bay!
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mattsurf




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PostPosted: Thu Mar 07, 2019 8:20 am    Post subject: Reply with quote

Chrace wrote:
Hmm.. thought so. Been reading some more and it's basically not possible due to 110 being, well, 110. The circumference is not enough to go smaller than 33 which Praxis seems to make.

I'm on Di2 hence only possible to go 34 on the rear (new Di2 can do 34, old can't). And since I have a P2M with 110bcd and 5-bolt I was hoping not to have to change that.

For mechanical you can get the Wolftooth Lindarets adapter allowing road shifter (or at least Ultegra) and MTB rear mech. Then 34x42 is possible.

Not sure I can be bothered to go 33x34 from 34x34.


I thought that the Wolftooth roadlink adapter works with Di2, although you may have some capacity issues

https://www.wolftoothcomponents.com/products/roadlink

see this article as well

http://biketestreviews.com/wolftooth-roadlink/

I have not tried Wolftooth adapter, however, many people on Paceline forum swear by them

https://forums.thepaceline.net/index.php
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Jorgan




Joined: 12 Nov 2007
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PostPosted: Thu Mar 07, 2019 8:55 am    Post subject: Reply with quote

Mungo wrote:

Praxis Gravel bike, people are getting them for IMUK...


Wow, they must have made some big changes to the Bolton course Very Happy
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mattsurf




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PostPosted: Thu Mar 07, 2019 9:16 am    Post subject: Reply with quote

Jorgan wrote:
Mungo wrote:

Praxis Gravel bike, people are getting them for IMUK...


Wow, they must have made some big changes to the Bolton course Very Happy


1x mountain bikes with 30 tooth chainset and 11-48 cassette is the way to go for IMUK
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Jorgan




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PostPosted: Thu Mar 07, 2019 9:27 am    Post subject: Reply with quote

mattsurf wrote:
Jorgan wrote:
Mungo wrote:

Praxis Gravel bike, people are getting them for IMUK...


Wow, they must have made some big changes to the Bolton course Very Happy


1x mountain bikes with 30 tooth chainset and 11-48 cassette is the way to go for IMUK


Tioga disc wheel & drop bars like Tomac yeah?
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mattsurf




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PostPosted: Thu Mar 07, 2019 9:37 am    Post subject: Reply with quote

Jorgan wrote:
mattsurf wrote:
Jorgan wrote:
Mungo wrote:

Praxis Gravel bike, people are getting them for IMUK...


Wow, they must have made some big changes to the Bolton course Very Happy


1x mountain bikes with 30 tooth chainset and 11-48 cassette is the way to go for IMUK


Tioga disc wheel & drop bars like Tomac yeah?


If I could find one, I would love to do an IM on it, just for the comments.... did any of those wheels survive?
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Jorgan




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PostPosted: Thu Mar 07, 2019 9:52 am    Post subject: Reply with quote

mattsurf wrote:

If I could find one, I would love to do an IM on it, just for the comments.... did any of those wheels survive?


I'm sure JT has one in his basement/garage wall.
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Mungo




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PostPosted: Thu Mar 07, 2019 11:35 pm    Post subject: Reply with quote

Wow, they must have made some big changes to the Bolton course
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Pan flat....honest....

Places left.... You and Matt would be looking at 5 hour bike splits for sure......

The gravel bike chainsets, not the full machine, that said.....

The "average" bike time will be slow bordering on silly slow.

Cut offs staying the same....?!
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Chrace




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PostPosted: Fri Mar 08, 2019 9:37 am    Post subject: Reply with quote

mattsurf wrote:
Chrace wrote:
Hmm.. thought so. Been reading some more and it's basically not possible due to 110 being, well, 110. The circumference is not enough to go smaller than 33 which Praxis seems to make.

I'm on Di2 hence only possible to go 34 on the rear (new Di2 can do 34, old can't). And since I have a P2M with 110bcd and 5-bolt I was hoping not to have to change that.

For mechanical you can get the Wolftooth Lindarets adapter allowing road shifter (or at least Ultegra) and MTB rear mech. Then 34x42 is possible.

Not sure I can be bothered to go 33x34 from 34x34.


I thought that the Wolftooth roadlink adapter works with Di2, although you may have some capacity issues

https://www.wolftoothcomponents.com/products/roadlink

see this article as well

http://biketestreviews.com/wolftooth-roadlink/

I have not tried Wolftooth adapter, however, many people on Paceline forum swear by them

https://forums.thepaceline.net/index.php

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.
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mattsurf




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PostPosted: Fri Mar 08, 2019 10:21 am    Post subject: Reply with quote

Chrace wrote:
mattsurf wrote:
Chrace wrote:
Hmm.. thought so. Been reading some more and it's basically not possible due to 110 being, well, 110. The circumference is not enough to go smaller than 33 which Praxis seems to make.

I'm on Di2 hence only possible to go 34 on the rear (new Di2 can do 34, old can't). And since I have a P2M with 110bcd and 5-bolt I was hoping not to have to change that.

For mechanical you can get the Wolftooth Lindarets adapter allowing road shifter (or at least Ultegra) and MTB rear mech. Then 34x42 is possible.

Not sure I can be bothered to go 33x34 from 34x34.


I thought that the Wolftooth roadlink adapter works with Di2, although you may have some capacity issues

https://www.wolftoothcomponents.com/products/roadlink

see this article as well

http://biketestreviews.com/wolftooth-roadlink/

I have not tried Wolftooth adapter, however, many people on Paceline forum swear by them

https://forums.thepaceline.net/index.php

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.
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