HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 10 posts ] 
Author Message
PostPosted: Sun May 19, 2013 12:47 pm 
Offline

Joined: Fri Dec 12, 2008 5:19 am
Posts: 607
Location: Brisbane, Oz
With the introduction of Dura-ace 9000 and 11 cogs on the cassette (and SRAM 22), the 9000 Dura-ace wheelsets acquired a wider freehub body to match the wider cassette, making 7900 and 7850 wheels incompatible with 11 speed. It seemed like a waste of some very nice 7900 and 7850 tubular wheelsets I have so I set about modifying them to make them compatible.

The 11 speed Shimano cassette is 2.85mm wider than the 10 speed one. As the 10 speed cassettes have a 1mm spacer behind them, this makes the feeehub 1.85mm wider. Conveniently the 10 speed freehub has stops at the end of each spline which are nearly 1.85mm deep. If these are machined down, and then just a fraction of the lip at the back of the freehub, an 11 speed cassette will fit.

Image

However, this then puts the lip which acts as a stop for the cassette 'inside' the hub. The cassette would bind with the hub when the lock ring is tightened. Some modification to the hub is also required. I figured I needed to take off about 1mm of the drive side hub flange. Unfortunately, my freehub was off at a friends workplace getting accurately machined in a lathe, and I was limited to a dremel and no real means of measuring how much I was taking off the hub. Very carefully with a cutting disc on the dremel I went about taking 1mm of the inside of the hub.

Image

I did this only on the part of the hub flange nearest to the freehub. The 11 speed cassette has a 0.5mm lip on the biggest cog, which will push the cassette out by as much from the end of the freehub. From there the cog goes outwards away from the hub even further so only a small amount of the hub close to the center needed to be removed.

Image

I think I ended up take off more material than I needed. Being impatient to finish the work, and not having the freehub to test things, meant I took a stab at how much to take off. I also wanted these wheels to be backwards compatible to 10 speed, so I needed to take off 1mm in a large enough diameter to take the 1.85mm spacer that is required to run 10 speed. The result isn't particularly neat, but OK for a cutting disc. I plan to pull it all apart again and neaten and then polish it all now that I know the whole thing works.

Image

My freehub came back machined perfectly, exactly as I'd hoped. A quick test showed my 9000 cassette fit on.

Image

I bolted the freehub onto the hub and could see that I'd taken enough material off to prevent the cassette from binding.

Image

Next I tested the 9000 cassette on the wheel and it cleared all parts of the hub. Count them, 11 cogs on a 7900 freehub. Adding spacers and my 10 speed cassette I put the wheel in my bike with 7970 Di2 and no adjustment was required. Everything worked fine. The RD is no where near the spokes on this wheelset.

Image

I'm happy with the result, it worked first time and means I can start using 11 speed and not have to worry about the additional expense of new wheels.

http://benmanson.com/review/7900_to_11/7900_to_11.htm


Top
 Profile  
 
PostPosted: Sun May 19, 2013 2:20 pm 
Offline

Joined: Wed Dec 03, 2008 7:20 pm
Posts: 14
Sooo much work... But thanks for sharing.


Top
 Profile  
 
Posted: Sun May 19, 2013 2:20 pm 


Top
  
 
PostPosted: Sun May 19, 2013 3:06 pm 
Offline
in the industry
User avatar

Joined: Sun Jul 29, 2012 2:59 pm
Posts: 526
Location: Ruidoso, NM
I wonder if the Wheels Manufacturing Accelerator 11 would have worked. Certainly much simpler. http://wheelsmfg.com/products/rear-driv ... sions.html

_________________
formerly rruff...


Top
 Profile  
 
PostPosted: Sun May 19, 2013 7:47 pm 
Offline

Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1450
Location: Santa Cruz, California, USA
The wheels site says All wheelset-compatible with the exception of Shimano Dura Ace or Ultegra factory wheelsets (not hubs laced on standard rims), and Chris King.

So probably not.

Nice work petal666.


Top
 Profile  
 
PostPosted: Mon May 20, 2013 4:24 pm 
Offline
in the industry
User avatar

Joined: Sun Jul 29, 2012 2:59 pm
Posts: 526
Location: Ruidoso, NM
Doh! Could work for other wheels, though.

I called WM to ask if they were going to make 11spd S Accelerators, and they were very non-committal. Granted C11 is nearly identical, but someone shelling out that kind of money for an Ultegra level cassette would surely prefer exact spacing. And the demand for a decent solution is pretty huge IMO. Many hub and wheel manufacturers are asking >$300 for the swap. And if you currently have excess derailleur or dropout clearance, the wheel will be stronger with the conversion cassette vs a swap, and won't need to be redished.

_________________
formerly rruff...


Top
 Profile  
 
PostPosted: Mon May 20, 2013 7:41 pm 
Offline

Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1450
Location: Santa Cruz, California, USA
They really ought to make them. They'd sell a bunch, assuming they worked with most wheels.
But I suspect that if the clearances would allow that, Shimano would have done it.


Top
 Profile  
 
PostPosted: Thu Jan 16, 2014 11:55 am 
Offline

Joined: Wed Mar 28, 2007 12:49 pm
Posts: 1551
Location: London, UK
Great piece of work. Thanks for sharing. However I don't really like the idea of dremelling the hub body. Would it be possible to machine the freehub body by only 1.3mm, then machine off the lip on the largest cog (0.5mm) to get the total 1.8mm spacing?


Top
 Profile  
 
PostPosted: Thu Jan 16, 2014 12:22 pm 
Offline

Joined: Fri Dec 12, 2008 5:19 am
Posts: 607
Location: Brisbane, Oz
Sounds a lot harder.


Top
 Profile  
 
PostPosted: Mon Jan 20, 2014 8:31 am 
Offline

Joined: Mon Jan 20, 2014 8:25 am
Posts: 1
Very interesting article thanks. Also planning to go 11 speed, and have a hand built wheelset with DA 7900, plus a Hope Pro3 wheelset - so very keen on converting rather than replacing. Have some good machine shops near here too, so I reckon your step-by-step will be a perfect guide for them. The ability to go back to 10spd on my other bike is also quite important too.

Before taking the plunge, very interested to know how you're finding the conversion is working out with some miles on it?


Top
 Profile  
 
Posted: Mon Jan 20, 2014 8:31 am 


Top
  
 
PostPosted: Mon Jan 20, 2014 8:52 am 
Offline
User avatar

Joined: Tue Aug 28, 2012 2:45 pm
Posts: 709
Location: Stockholm, The Arctic...
:thumbup:


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 


Who is online

Users browsing this forum: Baidu [Spider], BeeSeeBee, Bing [Bot], Exabot [Bot], fromtrektocolnago, Google [Bot], Google Adsense [Bot], JackDaniels, MSNbot Media, showdown, thprice, wheelzqc and 46 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Converting rear hub from 10 speed to 11 speed

[ Go to page: 1, 2 ]

in Road

sled driver

23

3999

Thu Jan 09, 2014 11:58 pm

Stefano View the latest post

There are no new unread posts for this topic. Converting 10 to 11 speed cassette

in Road

itsacarr

9

408

Wed Apr 23, 2014 10:59 pm

bikerjulio View the latest post

There are no new unread posts for this topic. Converting Wired into Wireless SRM

in Road

Stefano

4

423

Sat Feb 08, 2014 10:14 am

micky View the latest post

There are no new unread posts for this topic. Converting GXP Quarq to bb30

in Road

rheosibal

4

711

Wed Jul 10, 2013 5:03 am

rheosibal View the latest post

There are no new unread posts for this topic. Canyon BB guide?

in Road

Valy

3

356

Mon Mar 03, 2014 2:42 pm

Valy View the latest post


It is currently Thu Apr 24, 2014 2:57 am

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB