Go Back  Bike Forums > Bike Forums > Touring
Reload this Page >

Crankset for Surly Troll frame with Alfine 11 hub?

Notices
Touring Have a dream to ride a bike across your state, across the country, or around the world? Self-contained or fully supported? Trade ideas, adventures, and more in our bicycle touring forum.

Crankset for Surly Troll frame with Alfine 11 hub?

Old 04-06-16, 07:14 AM
  #1  
Junior Member
Thread Starter
 
Join Date: Apr 2016
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Crankset for Surly Troll frame with Alfine 11 hub?

Hi!
I need some help finding the right crankset and BB (73mm) for my Surly Troll frame with an Alfine 11 hub, chain line 41,8mm. Any ideas? I am a beginner so please write to me like one.
Cocosoff is offline  
Old 04-06-16, 08:32 AM
  #2  
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,598

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,355 Times in 862 Posts
A 3 piece square taper crank offers the potential to make the chainline of the crankset exactly match the IGH in the wheel .

as a beginner without the Mechanical background leave the parts choice up to a professional bike shop..

consult with them as to the size that is Ideal for the cog& chainring size, tooth count, gear Ratio
fietsbob is offline  
Old 04-06-16, 08:38 AM
  #3  
Senior Member
 
mdilthey's Avatar
 
Join Date: Jun 2012
Posts: 1,923

Bikes: Nature Boy 853 Disc, Pugsley SS

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 251 Post(s)
Likes: 0
Liked 8 Times in 6 Posts
Originally Posted by fietsbob
A 3 piece square taper crank offers the potential to make the chainline of the crankset exactly match the IGH in the wheel .

as a beginner without the Mechanical background leave the parts choice up to a professional bike shop..

consult with them as to the size that is Ideal for the cog& chainring size, tooth count, gear Ratio
Have to agree, you'll want to consult your local shop. Shimano XT cranksets tend to be very popular with touring trolls.
mdilthey is offline  
Old 04-06-16, 08:55 AM
  #4  
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,598

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,355 Times in 862 Posts
M730 the 80s XT is what Iv'e used ever since.. now others have made similar .. 110 bcd triple.. though since its a single chainring

a road , or track will do , the BB selection is the key to getting the chainline straight.
fietsbob is offline  
Old 04-06-16, 10:45 AM
  #5  
old fart
 
Join Date: Dec 2007
Location: PA-US
Posts: 379
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 119 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by Cocosoff
Alfine 11 hub, chain line 41,8mm
//snip

Don't get fooled by the above dimension.
The hub essentially offers 2 chainlines (the 2nd one - with the rear sprocket flipped), so you should consider a 47.5 mm chainline as well.

I built an Alfine 11 bike 4 years ago, but can not remember which of the two feasible chainline offsets I followed (the bike is home while I'm not)....
IK_biker is offline  
Old 04-06-16, 11:22 AM
  #6  
Senior Member
 
Rob_E's Avatar
 
Join Date: Jan 2008
Location: Raleigh, NC
Posts: 2,709

Bikes: Downtube 8H, Surly Troll

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 303 Post(s)
Liked 22 Times in 21 Posts
I used a 110 square taper bottom bracket (with an Alfine 8). I plan to replace it with an external set-up, but it's working so far. The trick with square taper is that sometimes you can't find a published chain line measurement for a given crank, and, if you do find one, you have to adapt their measurements for your axle. To get the chain line right, I tried a number of things: moving the chainring between the inside and outside of the spider, and adding spacers between the chainring and the spider, and flipping the dished cog on the back. It's sorted now, so I haven't really fiddled with it, but I feel like it would have been easier with an external bottom bracket with a couple of bottom bracket spacers to adjust the chain line.
Rob_E is offline  
Old 04-06-16, 05:32 PM
  #7  
Junior Member
Thread Starter
 
Join Date: Apr 2016
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thank you all, you have given me a lot to think of!

Originally Posted by IK_biker
//snip
Don't get fooled by the above dimension.
The hub essentially offers 2 chainlines (the 2nd one - with the rear sprocket flipped), so you should consider a 47.5 mm chainline as well.
That's really interesting, if I could flip it. The thing is that my sprocket has a plastic chain guide attached to it so I guess it's hard. Can't try yet, my wheels and the hub isn't here right now. Maybe I can just get it off but I guess it's there for a reason.
Attached Images
File Type: jpg
20160407_012454.jpg (95.3 KB, 36 views)
Cocosoff is offline  
Old 04-06-16, 07:56 PM
  #8  
old fart
 
Join Date: Dec 2007
Location: PA-US
Posts: 379
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 119 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by Cocosoff
my sprocket has a plastic chain guide attached to it
No reason, other than aesthetics. The guard provides no functionality whatsoever.
Consider ripping the plastics off.

I checked, it turns out I have used the ~42 mm chainline by utilizing a Hollowtech II BB and a singlespeed Shimano crankset.
Also, my records show that I have toyed with the alternate chainline offset, and the offset I have noted for that kind of setup is 46.8 mm.

Good luck!
IK_biker is offline  
Old 04-06-16, 07:59 PM
  #9  
Senior Member
 
Rob_E's Avatar
 
Join Date: Jan 2008
Location: Raleigh, NC
Posts: 2,709

Bikes: Downtube 8H, Surly Troll

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 303 Post(s)
Liked 22 Times in 21 Posts
Originally Posted by Cocosoff
Thank you all, you have given me a lot to think of!


That's really interesting, if I could flip it. The thing is that my sprocket has a plastic chain guide attached to it so I guess it's hard. Can't try yet, my wheels and the hub isn't here right now. Maybe I can just get it off but I guess it's there for a reason.
I took mine off. It was a pain, but it didn't cause any problem. Also bought some other cogs that didn't have the guard thing.
Rob_E is offline  
Old 04-07-16, 10:55 AM
  #10  
Junior Member
Thread Starter
 
Join Date: Apr 2016
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by IK_biker
I checked, it turns out I have used the ~42 mm chainline by utilizing a Hollowtech II BB and a singlespeed Shimano crankset.
Also, my records show that I have toyed with the alternate chainline offset, and the offset I have noted for that kind of setup is 46.8 mm.
Good luck!
Thanks for checking! You don't happen to know which Shimano singlespeed crankset?

By the way... is it possible to adjust the chain line at the rear hub or is it a big NO?
Cocosoff is offline  
Old 04-07-16, 10:57 AM
  #11  
Junior Member
Thread Starter
 
Join Date: Apr 2016
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Rob_E
I took mine off. It was a pain, but it didn't cause any problem. Also bought some other cogs that didn't have the guard thing.
Good to know, I think I will end up doing that as well!
Cocosoff is offline  
Old 04-08-16, 07:14 AM
  #12  
old fart
 
Join Date: Dec 2007
Location: PA-US
Posts: 379
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 119 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by Cocosoff
Thanks for checking! You don't happen to know which Shimano singlespeed crankset?

By the way... is it possible to adjust the chain line at the rear hub or is it a big NO?
As it turns out, I have scored a great deal, getting the original Shimano Alfine s500 crankset with the bottom bracket for a total of $62 (purchased back in December 2012).
This setup in 39t is what's still on my Alfine 11 bike.

As to adjusting chainline at the hub - it is not possible, other than playing with the dished cog offset. And unnecessary as you can match the hub's chainline on the crankset side within a few tenths of a milimeter.
IK_biker is offline  
Old 04-08-16, 07:41 AM
  #13  
Junior Member
Thread Starter
 
Join Date: Apr 2016
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by IK_biker
As it turns out, I have scored a great deal, getting the original Shimano Alfine s500 crankset with the bottom bracket for a total of $62 (purchased back in December 2012).
This setup in 39t is what's still on my Alfine 11 bike.
That is what I thought was the perfect solution for me, before I realised that most bikes are made for a BB with of 68mm while I have 73mm on my Troll. The Alfine crankset doesn't fit.

Originally Posted by IK_biker
As to adjusting chainline at the hub - it is not possible, other than playing with the dished cog offset. And unnecessary as you can match the hub's chainline on the crankset side within a few tenths of a milimeter.
Thanks for the information! I learn a lot every day.
Cocosoff is offline  
Old 04-08-16, 07:48 AM
  #14  
Senior Member
 
Rob_E's Avatar
 
Join Date: Jan 2008
Location: Raleigh, NC
Posts: 2,709

Bikes: Downtube 8H, Surly Troll

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 303 Post(s)
Liked 22 Times in 21 Posts
Originally Posted by Cocosoff
That is what I thought was the perfect solution for me, before I realised that most bikes are made for a BB with of 68mm while I have 73mm on my Troll. The Alfine crankset doesn't fit.
I thought there was an Alfine crankset that did fit. Could be wrong, though.

But 73mm is pretty standard mountain bike bottom bracket width. You will not have a problem finding a compatible crankset.
Rob_E is offline  
Old 04-08-16, 09:24 AM
  #15  
Junior Member
Thread Starter
 
Join Date: Apr 2016
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Rob_E
I thought there was an Alfine crankset that did fit. Could be wrong, though.
Aaah, in that case I will look for that! It might be that I just bought the wrong one, I will look into it. Thanks a lot!
Cocosoff is offline  
Old 04-08-16, 09:27 AM
  #16  
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,598

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,355 Times in 862 Posts
Just may be made for 68 wide BB. IDK if they make 2.
fietsbob is offline  
Old 04-08-16, 09:35 AM
  #17  
Senior Member
 
Rob_E's Avatar
 
Join Date: Jan 2008
Location: Raleigh, NC
Posts: 2,709

Bikes: Downtube 8H, Surly Troll

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 303 Post(s)
Liked 22 Times in 21 Posts
This thread says that the octalink version can be used with 73mm shells: https://www.bikeforums.net/bicycle-me...-crankset.html
Don't know if it's accurate, and I don't know if I'd try it. I feel like there are so many cranksets that specify 73mm compatibility, that I probably wouldn't take my chances on one that doesn't.
Rob_E is offline  
Old 04-08-16, 10:46 AM
  #18  
Clark W. Griswold
 
Join Date: Mar 2014
Location: ,location, location
Posts: 13,403

Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Phil Wood Apple VeloXS Frame (w/DA 7400), R+M Supercharger2 Rohloff, Habanero Ti 26

Mentioned: 54 Post(s)
Tagged: 0 Thread(s)
Quoted: 4301 Post(s)
Liked 3,922 Times in 2,622 Posts
Originally Posted by fietsbob
A 3 piece square taper crank offers the potential to make the chainline of the crankset exactly match the IGH in the wheel .

as a beginner without the Mechanical background leave the parts choice up to a professional bike shop..

consult with them as to the size that is Ideal for the cog& chainring size, tooth count, gear Ratio
A gigantic +1.

If I were looking for a crankset I would go Sugino, they make a bunch of nice square taper cranks and SKF makes some great BBs. If you are looking for a cheaper BB, IRD makes one that is quite high quality and well sealed called the QB-95 Defiant which is about half of a SKF (though I think SKF is pretty tops with their sealing and bearings).
veganbikes is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
teknohippie
Singlespeed & Fixed Gear
8
07-15-15 12:49 PM
Solid_Spoke
Bicycle Mechanics
4
02-11-14 06:12 PM
Rhythm of Life
Singlespeed & Fixed Gear
7
08-24-12 06:37 PM
Barchettaman
Bicycle Mechanics
15
06-10-12 03:58 PM
ocfixie
Singlespeed & Fixed Gear
6
04-05-11 10:44 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.