Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 03-06-09, 09:11 AM   #1
andr0id
Senior Member
Thread Starter
 
andr0id's Avatar
 
Join Date: Feb 2009
Bikes:
Posts: 2,121
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 136 Post(s)
Anybody used a SRAM 11-28?

Anybody use the SRAM OG-1070 in the 11-28 size?

Looks like it would give good range with my 30/42/53 front end.

If you've got one, how does it shift and is it noisy?

I have a long cage XTR rear derailleur.
andr0id is offline   Reply With Quote
Old 03-06-09, 11:31 AM   #2
rishardh
Senior Member
 
rishardh's Avatar
 
Join Date: Jun 2008
Location: North Texas
Bikes: Kestrel Talon; Giant NRS Air; Litespeed Tuscany; Burley Rivazza; Cerverlo RS; BMC SLX01; Litespeed C1r
Posts: 364
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've got the SRAM 11-28 with 30/42 up front. I converted my drivetrain to SRAM though. It shifts super fast with no issues. Probably this post is not helpful for you though. Do not know how it will perform with a Shimano XTR RD.
rishardh is offline   Reply With Quote
Old 03-06-09, 08:59 PM   #3
sch
Senior Member
 
Join Date: May 2003
Location: Mountain Brook. AL
Bikes:
Posts: 3,008
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
We have about 1500 miles on an 11-28 10spd SRAM cassette and find it shifts well and
as long as you keep to short hills with 15% or so grades and avoid multi-mile 8-9%
grades that it works well and gives a nice selection of gears in the 20-35mph range.
I occasionally wish for a 32 cog but wouldn't want to give up the close spaced 11-17
area. We walked a 75yd long 20% grade once. Our RD is a long cage DA, doubt there
would be a problem with XTR. I found my first cassette through Amazon and a couple
of spares through ProBikit at about $75-80 ea. We switched from an 11-26 and haven't
looked back.
sch is offline   Reply With Quote
Old 03-06-09, 09:47 PM   #4
Butcher
Senior Member
 
Join Date: Sep 2007
Location: Kent, WA
Bikes: 2005 S-Works SR Equipped,1978 Tom Ritchie Road bike, Kuwahara Tandem
Posts: 494
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
We enjoy ours. We have not had any issues and have heard no abnormal noises. We are using a Record drivetrain [long cage RD] with 53-43-30. This year we are going to try a 28 and we may go to a 55 but I do not have that yet. We do not have 20% hills and I agree that we would have to walk that one. The most we have tried is a 16% for a short distance [<.5 miles long].
Butcher is offline   Reply With Quote
Old 03-07-09, 02:50 PM   #5
bikeriderdave
Cyclist
 
Join Date: Apr 2004
Location: Wisconsin, USA
Bikes:
Posts: 166
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Go for it. We have one on our triple. It shifts really well with an XT rear derailleur and Ultegra brifters. Can't say for sure that it's quiet on the road (the rear wheel is a looong way behind me), but it's certainly quiet in the bike stand.
bikeriderdave is offline   Reply With Quote
Old 03-07-09, 05:21 PM   #6
andr0id
Senior Member
Thread Starter
 
andr0id's Avatar
 
Join Date: Feb 2009
Bikes:
Posts: 2,121
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 136 Post(s)
Cool, I'm getting one! Thanks for the feedback.
andr0id is offline   Reply With Quote
Old 03-09-09, 01:30 AM   #7
Chris_W
Gear Combo Guru
 
Chris_W's Avatar
 
Join Date: May 2007
Location: Switzerland
Bikes: Spec' Tarmac (road), Ridley Fenix (commuter & fast tourer), Salsa Mamasita (MTB), CoMo Speedster (tandem), Surly Big Dummy (cargo), Airnimal (folder)
Posts: 2,241
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I don't like the spacing at the top end of SRAM's 11-28 cassette: 19-22-25-28. The 19-22 and 22-25 shifts felt too big for me, around 15% difference when I prefer around 10%. Shimano's 12-27 has the same problem with the 21-24 jump. I've therefore built a custom 12-28 by taking a 12-25, removing the 16 tooth cog, and putting a spacer and a 28 tooth single cog (taken from an old LX cassette) at the back. Our lower gears are now 19-21-23-25-28, which results in perfectly smooth cadence changes. We don't have a 16 tooth cog, but nor does SRAM's 11-28 cassette, so in comparison, the only thing we lost was the 11 tooth cog. I decided that we'd use that for a much smaller proportion of the time than we do the lower gears, so I'm willing to give it up in exchange for closer spacing at the other end. I wish someone would make a stock 12-28 cassette with these cog sizes.

Up front we had a 30-39-53, but I already changed the small ring to a 28. For riding in the Swiss alps (which we do a lot) and maintaining a reasonably high cadence, I'm thinking of going even lower on the small a ring to a 26 tooth, to keep the shifting smoother, I'll drop the middle ring down to the minimum size (for the 130mm BCD) of 38 teeth. Hopefully, our 26-38-53 should then work quite nicely. Because of the big range that results in, I've swapped the Ultegra rear derailleur for an XT to prevent the chain from going slack when we're on the small ring.

Last edited by Chris_W; 03-10-09 at 03:09 AM.
Chris_W is offline   Reply With Quote
Old 03-09-09, 05:02 AM   #8
JayB
Senior Member
 
Join Date: Sep 2005
Bikes:
Posts: 154
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Chris,
What sort of front mech do you have? Does it cope well with the smaller inner chainring?
JayB
__________________
JayB
JayB is offline   Reply With Quote
Old 03-09-09, 06:07 AM   #9
tandem rider
Senior Member
 
Join Date: Dec 2005
Location: Indianapolis, IN
Bikes: Co-Motion tandem, Serotta, and Specialized mt. bike
Posts: 348
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Chris,
What type of crankset and shifters are you using? I tried a 28 small chainring and could not get consistent shifting with STI on Ultegra.
Thanks
Sheldon
tandem rider is offline   Reply With Quote
Old 03-09-09, 06:19 AM   #10
rmac
Senior Member
 
Join Date: May 2005
Bikes:
Posts: 569
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have a 26 chainring, TA rings, Ultegra shifters, and Ultegra front derailleur on our Cannondale and it shifts fine. We do have a chainwatcher on it.
rmac is offline   Reply With Quote
Old 03-09-09, 10:14 AM   #11
Chris_W
Gear Combo Guru
 
Chris_W's Avatar
 
Join Date: May 2007
Location: Switzerland
Bikes: Spec' Tarmac (road), Ridley Fenix (commuter & fast tourer), Salsa Mamasita (MTB), CoMo Speedster (tandem), Surly Big Dummy (cargo), Airnimal (folder)
Posts: 2,241
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by JayB View Post
What sort of front mech do you have? Does it cope well with the smaller inner chainring?
Quote:
Originally Posted by tandem rider View Post
What type of crankset and shifters are you using? I tried a 28 small chainring and could not get consistent shifting with STI on Ultegra.
I use an Ultegra (6600) triple front derailleur and STI brifter. On both of our road/racing bikes, we also have either 26 or 28 tooth inner chainrings, and again mostly have Ultegra shifters and derailleurs, but I know that using a 26 or 28 tooth chainring also works equally well with 105 gear. I've also done the modification on several friend's bikes, and they've all been happy (anyone living in Switzerland spends lots of time in the little ring). The tail of the front derailleur is plenty long enough to handle this without trouble, and I haven't noticed that using the STI brifter causes any additional problems.

However, I don't like using an STI brifter for the front derailleur (regardless of chainring sizes), so I'm about to replace this with a bar-end shifter. The advantages of that are that I'll get continuous control of the front derailleur (not indexed) and a visual cue as to which chainring the chain is on (I already have an inline gear indicator to show me the same for the rear shifter). On my single road bike and tourer, I use a down-tube shifter for the front derailleur (with an STI for the rear), but on the tandem I'd like to keep my hands on the bars while shifting, so I'm going with a bar-end shifter there.

As rmac said, make sure you have some sort of chain retention device on to prevent the chain from falling off when shifting down to the inner ring (there's lots of info on these on the forum already) - these are also used by several pro' riders because they can't afford to lose their chain at the worse time (which is when it will happen). TA certainly make the nicest chainrings (we'll be using an inner 26-tooth and middle 38-tooth from TA), but there are many cheaper options available to get a 26 or 28 tooth small ring, starting at around US$15.

Edit: To answer the other question, the crankset used makes no difference, but on the tandem we have an FSA Gossamer, on single bikes I've put smaller inner rings on Shimano 105 (5505 and 5603), Ultegra (6603), and Ultegra SL (6604), and all work equally well.

Last edited by Chris_W; 03-10-09 at 03:14 AM.
Chris_W is offline   Reply With Quote
Old 03-09-09, 05:43 PM   #12
colotandem 
Senior Member
 
colotandem's Avatar
 
Join Date: Oct 2007
Location: Golden, CO
Bikes: n+1
Posts: 321
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
We've had good results with the 11-28 using a Dura Ace deraileur. If you're gonna be racing crits or something, it may not be perfect (as mentioned there are some larger moves between cogs), but the range is sure nice for us (we do a lot of mountain riding). A couple thousand miles and no issues.
colotandem is offline   Reply With Quote
Old 03-09-09, 06:52 PM   #13
andr0id
Senior Member
Thread Starter
 
andr0id's Avatar
 
Join Date: Feb 2009
Bikes:
Posts: 2,121
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 136 Post(s)
Quote:
Originally Posted by colotandem View Post
If you're gonna be racing crits or something, it may not be perfect
Ha Ha!! Yes, I am going to talk The Wife into racing crits on the tandem!
andr0id is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 12:08 PM.