Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

How to switch DA 7800 crankset with FSA SLK Carbon?

Notices
Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

How to switch DA 7800 crankset with FSA SLK Carbon?

Old 04-09-20, 08:13 AM
  #1  
Trenton
South, Central Pa rider
Thread Starter
 
Trenton's Avatar
 
Join Date: Aug 2008
Location: Just south of York, Penna
Posts: 32

Bikes: Fuji Roubaix SL 2006, Dura-ace 7800 with Ultegra SL 6600g wheels

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 7 Times in 6 Posts
How to switch DA 7800 crankset with FSA SLK Carbon?

Will someone please tell me what else I would need to buy to switch my Dura-Ace 7800 53/39 crankset with an FSA SLK Carbon compact crank? I have a 2006 Fuji aluminium road frame with the DA 7800 bottom bracket. Can I just pull the DA 7800 crank and use the FSA crank with the DA 7800 BB? Are there specific Bottom Bracket cups that match the FSA SLK crank?

I would like to use this FSA Carbon Crankset:


On my 2006 Fuji Roubaix SL w/Dura-Ace 7800:

I have a short-cage DA 7800 rear derailleur and DA 7900 10speed 11-28 cassettes.

Thank you!!!

Trent
Trenton is offline  
Old 04-09-20, 08:21 AM
  #2  
mprince
Senior Member
 
Join Date: Sep 2019
Location: Mooresville, NC
Posts: 84

Bikes: Steelman Stage Race, Dura-Ace 9s

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Liked 37 Times in 21 Posts
I don't believe the Shimano BB cups will work with the FSA crankset, you will need a new BB.

Disclaimer - the most modern BB I am working with is Shimano Octalink, so I am a bit dated in this area.
mprince is offline  
Old 04-09-20, 08:43 AM
  #3  
Trenton
South, Central Pa rider
Thread Starter
 
Trenton's Avatar
 
Join Date: Aug 2008
Location: Just south of York, Penna
Posts: 32

Bikes: Fuji Roubaix SL 2006, Dura-ace 7800 with Ultegra SL 6600g wheels

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 7 Times in 6 Posts
That's funny - when I first used the Fuji frame, I used Ultegra 6500 and liked the Octalink crankset.
Trenton is offline  
Old 04-09-20, 08:44 AM
  #4  
Trenton
South, Central Pa rider
Thread Starter
 
Trenton's Avatar
 
Join Date: Aug 2008
Location: Just south of York, Penna
Posts: 32

Bikes: Fuji Roubaix SL 2006, Dura-ace 7800 with Ultegra SL 6600g wheels

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 7 Times in 6 Posts
Correction... I used Ultegra 6500 on a Giant Kronos frame. Then switched that to DA 7800 and then moved that over to the Fuji Roubaix SL frame.
Trenton is offline  
Old 04-09-20, 09:35 AM
  #5  
noodle soup
Senior Member
 
noodle soup's Avatar
 
Join Date: Nov 2015
Posts: 7,747
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 3921 Post(s)
Liked 938 Times in 543 Posts
You will need a different BB for that crankset because of the 30mm spindle. If the frame is BSA threaded, something like this will work.

https://www.jensonusa.com/Hope-6873m...Bottom-Bracket
noodle soup is online now  
Old 04-09-20, 10:59 PM
  #6  
Camilo
Senior Member
 
Join Date: Apr 2007
Posts: 4,694
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 300 Post(s)
Liked 76 Times in 50 Posts
Cranks usually specify what BB to use with them. Does the bike have a threaded or press-fit BB? Either should be doable, just that the threaded might be easier for a DIY'er. There's press-fit adapters for almost everything. FSA's a common crank, so that should not be a problem.
Camilo is offline  
Old 04-09-20, 11:12 PM
  #7  
Drew Eckhardt 
Senior Member
 
Drew Eckhardt's Avatar
 
Join Date: Apr 2010
Location: Mountain View, CA USA and Golden, CO USA
Posts: 6,022

Bikes: 97 Litespeed, 50-39-30x13-26 10 cogs, Campagnolo Ultrashift, retroreflective rims on SON28/PowerTap hubs

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 399 Post(s)
Liked 136 Times in 102 Posts
Scratch that, the BB-right mark hides in the glare.

Last edited by Drew Eckhardt; 04-10-20 at 10:18 AM.
Drew Eckhardt is offline  
Likes For Drew Eckhardt:
Old 04-10-20, 07:17 AM
  #8  
Kimmo 
bike whisperer
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 8,565

Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231

Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 779 Post(s)
Liked 178 Times in 142 Posts
Onya Drew.

I've seen those FSA cranks before, but I only just noticed how hard the rings mimic 7800.

...Hang on - BBRight cranks? Isn't that just BB386 evo?

Last edited by Kimmo; 04-10-20 at 07:22 AM.
Kimmo is offline  
Old 04-10-20, 08:05 AM
  #9  
noodle soup
Senior Member
 
noodle soup's Avatar
 
Join Date: Nov 2015
Posts: 7,747
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 3921 Post(s)
Liked 938 Times in 543 Posts
Originally Posted by Kimmo View Post
Onya Drew.

I've seen those FSA cranks before, but I only just noticed how hard the rings mimic 7800.

...Hang on - BBRight cranks? Isn't that just BB386 evo?
It's a 30mm spindle, so Drew's advice is incorrect.
noodle soup is online now  
Old 04-10-20, 08:35 AM
  #10  
noodle soup
Senior Member
 
noodle soup's Avatar
 
Join Date: Nov 2015
Posts: 7,747
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 3921 Post(s)
Liked 938 Times in 543 Posts
Originally Posted by Kimmo View Post
Onya Drew.

I've seen those FSA cranks before, but I only just noticed how hard the rings mimic 7800.

...Hang on - BBRight cranks? Isn't that just BB386 evo?
"What is the difference between BBright™ and BB30™? A. For the crank, BBright™ uses the same diameter axle as BB30™, with the addition of 11mm length on the left side of the spindle, and the left crank is straighter, (similar to existing arms for external bearing cranks)."

these might work on the OP bike, but he'll need a BB like this one
https://www.jensonusa.com/Hope-6873m...Bottom-Bracket
noodle soup is online now  
Old 04-10-20, 10:17 AM
  #11  
Drew Eckhardt 
Senior Member
 
Drew Eckhardt's Avatar
 
Join Date: Apr 2010
Location: Mountain View, CA USA and Golden, CO USA
Posts: 6,022

Bikes: 97 Litespeed, 50-39-30x13-26 10 cogs, Campagnolo Ultrashift, retroreflective rims on SON28/PowerTap hubs

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 399 Post(s)
Liked 136 Times in 102 Posts
Originally Posted by noodle soup View Post
It's a 30mm spindle, so Drew's advice is incorrect.
Yeah, that "BBRight" mark is hiding in the flash glare.

Without that the SLK Light cranks are 24mm parts.
Drew Eckhardt is offline  
Likes For Drew Eckhardt:
Old 04-15-20, 12:13 PM
  #12  
Trenton
South, Central Pa rider
Thread Starter
 
Trenton's Avatar
 
Join Date: Aug 2008
Location: Just south of York, Penna
Posts: 32

Bikes: Fuji Roubaix SL 2006, Dura-ace 7800 with Ultegra SL 6600g wheels

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 7 Times in 6 Posts
Thank you everyone for your quick answers! I've read the advise and it doesn't sound as easy as a switch as I had hoped, or assumed. So I am going to stick with the 7800 53/39 crank-set for the summer and next winter beg my boss (wife) for a new carbon bike.

My next question would have been whether the 7800 DA short-cage derailleur would work with the compact crank-set I asked about. And if not, then there would be another purchase.
Trenton is offline  
Old 04-15-20, 12:23 PM
  #13  
noodle soup
Senior Member
 
noodle soup's Avatar
 
Join Date: Nov 2015
Posts: 7,747
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 3921 Post(s)
Liked 938 Times in 543 Posts
Originally Posted by Trenton View Post
Thank you everyone for your quick answers! I've read the advise and it doesn't sound as easy as a switch as I had hoped, or assumed. So I am going to stick with the 7800 53/39 crank-set for the summer and next winter beg my boss (wife) for a new carbon bike.

My next question would have been whether the 7800 DA short-cage derailleur would work with the compact crank-set I asked about. And if not, then there would be another purchase.
It's really not a big dual to swap the BB, but I'd rather have the 7800 crankset.

Are you trying to get a smaller inner ring?

The derailleur will work fine with a compact crank, but a 28t max is the largest cassette you can use.
noodle soup is online now  
Old 04-15-20, 01:10 PM
  #14  
Trenton
South, Central Pa rider
Thread Starter
 
Trenton's Avatar
 
Join Date: Aug 2008
Location: Just south of York, Penna
Posts: 32

Bikes: Fuji Roubaix SL 2006, Dura-ace 7800 with Ultegra SL 6600g wheels

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 7 Times in 6 Posts
That's exactly what I'm trying to do... get a smaller, inner ring for the hills around the Susquehanna River in south, central Penna. Do you know of anyone that makes rings for DA 7800 cranks? I switched the cassettes to DA 7900, 11-28t.
Trenton is offline  
Old 04-15-20, 01:13 PM
  #15  
noodle soup
Senior Member
 
noodle soup's Avatar
 
Join Date: Nov 2015
Posts: 7,747
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 3921 Post(s)
Liked 938 Times in 543 Posts
Originally Posted by Trenton View Post
That's exactly what I'm trying to do... get a smaller, inner ring for the hills around the Susquehanna River in south, central Penna. Do you know of anyone that makes rings for DA 7800 cranks? I switched the cassettes to DA 7900, 11-28t.
you can get a 50T big ring, but the smallest Shimano inner ring is 39t.

look around for a 38t inner, but that's not much help.
noodle soup is online now  
Old 04-15-20, 02:22 PM
  #16  
RiceAWay
Senior Member
 
Join Date: Dec 2018
Posts: 216
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 155 Post(s)
Liked 40 Times in 31 Posts
Originally Posted by Trenton View Post
Will someone please tell me what else I would need to buy to switch my Dura-Ace 7800 53/39 crankset with an FSA SLK Carbon compact crank? I have a 2006 Fuji aluminium road frame with the DA 7800 bottom bracket. Can I just pull the DA 7800 crank and use the FSA crank with the DA 7800 BB? Are there specific Bottom Bracket cups that match the FSA SLK crank?

I would like to use this FSA Carbon Crankset:


On my 2006 Fuji Roubaix SL w/Dura-Ace 7800:

I have a short-cage DA 7800 rear derailleur and DA 7900 10speed 11-28 cassettes.

Thank you!!!

Trent
Firstly you need to make certain that the bottom bracket is large enough in diameter to sustain the 30 mm MegaExo crank axle. Many are not.

Also be careful NOT to get a BB50 cranks since there are a ton of those out there for real cheap. These only work on narrow carbon fiber BB's with push-in bearings.

If you have a BB386 crank and frame BB you just buy the correct BSA BB386 30 mm cups and screw them in. Do NOT overtighten since BSA cups normally tighten themselves and if they are tight to begin with they can lock in and be extremely difficult to extract in the future.
RiceAWay is offline  
Old 04-15-20, 03:36 PM
  #17  
mercator
In the wind
 
mercator's Avatar
 
Join Date: Aug 2006
Location: Calgary AB
Posts: 1,237

Bikes: Giant TCR Advanced Team, Lemond Buenos Aires, Giant TCX, Miyata 1000LT

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 144 Post(s)
Liked 27 Times in 12 Posts
Originally Posted by Trenton View Post
That's exactly what I'm trying to do... get a smaller, inner ring for the hills around the Susquehanna River in south, central Penna. Do you know of anyone that makes rings for DA 7800 cranks? I switched the cassettes to DA 7900, 11-28t.
I have the same crank and derailleur as yours and successfully run an Ultegra 12-30 cassette.
Ratios are comparable to a compact with an 11-28 cassette.
I had to adjust the B-screw to the maximum position.
mercator is offline  
Likes For mercator:
Old 04-15-20, 04:01 PM
  #18  
noodle soup
Senior Member
 
noodle soup's Avatar
 
Join Date: Nov 2015
Posts: 7,747
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 3921 Post(s)
Liked 938 Times in 543 Posts
Originally Posted by mercator View Post
I have the same crank and derailleur as yours and successfully run an Ultegra 12-30 cassette.
Ratios are comparable to a compact with an 11-28 cassette.
I had to adjust the B-screw to the maximum position.
most mechanics know that Shimano is a little conservative with the max cassette cog rating. 30t isn’t surprising for a 7800 derailleur, and using a 50/34 crankset isn’t a problem for that derailleur either.

the problem he has is that his crankset won’t take a 36t or smaller chainring.

if I was the OP, I’d look for a silver 5700 compact crankset, and a 12-30 10spd cassette.
noodle soup is online now  
Old 04-15-20, 04:04 PM
  #19  
noodle soup
Senior Member
 
noodle soup's Avatar
 
Join Date: Nov 2015
Posts: 7,747
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 3921 Post(s)
Liked 938 Times in 543 Posts
Originally Posted by noodle soup View Post
most mechanics know that Shimano is a little conservative with the max cassette cog rating. 30t isn’t surprising for a 7800 derailleur, and using a 50/34 crankset isn’t a problem for that derailleur either.

the problem he has is that his crankset won’t take a 36t or smaller chainring.

if I was the OP, I’d look for a silver 5700 compact crankset, and a 12-30 10spd cassette.
if that crankset is in good shape, and the rings are low mileage(under20k miles), selling the crankset should pay for the parts.
noodle soup is online now  
Old 04-15-20, 05:16 PM
  #20  
Trenton
South, Central Pa rider
Thread Starter
 
Trenton's Avatar
 
Join Date: Aug 2008
Location: Just south of York, Penna
Posts: 32

Bikes: Fuji Roubaix SL 2006, Dura-ace 7800 with Ultegra SL 6600g wheels

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 7 Times in 6 Posts
Wow, again thank you everyone for the continued comments - you guys really do care!

I think I'll try the Ultegra 6700 12-30t cassettes! I didn't realize they existed and I understand your reference to the B-screw adjustment to pull the pulley/cage away from the 30t sprocket.

I think I'll try the 12-30t this summer and stick with the DA 7800 crank.

Trent
Trenton is offline  
Old 05-13-20, 07:29 AM
  #21  
Trenton
South, Central Pa rider
Thread Starter
 
Trenton's Avatar
 
Join Date: Aug 2008
Location: Just south of York, Penna
Posts: 32

Bikes: Fuji Roubaix SL 2006, Dura-ace 7800 with Ultegra SL 6600g wheels

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 7 Times in 6 Posts
So... just to add an ending to this story for now, I'm going to try a mid-compact DA 9000 crank (riding 40+ miles this afternoon in Lancaster/York counties). First impressions from the stand is the new 9000 crank-set is noisier than the DA-7800. Of course, not an issue on the road. The other thing I did (wrong/incorrectly) was shorten the chain, so I'm a bit nervous. With the 52/36 crank, and pedaling in the 36 up front and 28 in the back, I could hear additional noise in the back - not that the rear derailleur was bouncing off the 28T, just noticeably noisier, kind of a grinding sound. I pushed the hanger adj, B-screw all the way in to push the derailleur off the 28T to no avail... so I cut out a link of the chain. That worked BUT if I use 52 & 28, the rear derailleur is basically a straight line and once stuck the crank, ergh!

Not sure what's next... OTHER than never using 52/28 or even 52/26 combos.

I'm thinking about replacing the rear DA-7800 with a DA-9000 rear derailleur - thinking, well hoping DA-9000 has a longer cage. Does anyone know if that's the case? The DA-9100 rear cage certainly looks longer but it's mounting bolt area seems different than the mount for my DA-7800 derailleur.

Anyway, thank you everyone for helping me. Trent.

Trenton is offline  
Old 05-13-20, 07:48 AM
  #22  
mercator
In the wind
 
mercator's Avatar
 
Join Date: Aug 2006
Location: Calgary AB
Posts: 1,237

Bikes: Giant TCR Advanced Team, Lemond Buenos Aires, Giant TCX, Miyata 1000LT

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 144 Post(s)
Liked 27 Times in 12 Posts
Originally Posted by Trenton View Post
So... just to add an ending to this story for now, I'm going to try a mid-compact DA 9000 crank (riding 40+ miles this afternoon in Lancaster/York counties). First impressions from the stand is the new 9000 crank-set is noisier than the DA-7800. Of course, not an issue on the road. The other thing I did (wrong/incorrectly) was shorten the chain, so I'm a bit nervous. With the 52/36 crank, and pedaling in the 36 up front and 28 in the back, I could hear additional noise in the back - not that the rear derailleur was bouncing off the 28T, just noticeably noisier, kind of a grinding sound. I pushed the hanger adj, B-screw all the way in to push the derailleur off the 28T to no avail... so I cut out a link of the chain. That worked BUT if I use 52 & 28, the rear derailleur is basically a straight line and once stuck the crank, ergh!

Not sure what's next... OTHER than never using 52/28 or even 52/26 combos.

I'm thinking about replacing the rear DA-7800 with a DA-9000 rear derailleur - thinking, well hoping DA-9000 has a longer cage. Does anyone know if that's the case? The DA-9100 rear cage certainly looks longer but it's mounting bolt area seems different than the mount for my DA-7800 derailleur.

Anyway, thank you everyone for helping me. Trent.
A couple of comments:
- cross-chaining (52/28) is usually a bad idea. You should shift to the small ring before you get to the smallest cog. The chain needs to be long enough to handle it, but that doesn't mean you should ride that way.
- I don't think shimano recommends mixing 10 and 11 speed shifty bits, or if it can even be made to work. You are probably ok with the 11 speed crank, but if you go to a 9100 derailleur, you will likely also need 11 speed shifters, cassette and chain.
mercator is offline  
Old 05-13-20, 08:03 AM
  #23  
noodle soup
Senior Member
 
noodle soup's Avatar
 
Join Date: Nov 2015
Posts: 7,747
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 3921 Post(s)
Liked 938 Times in 543 Posts
Originally Posted by Trenton View Post
So... just to add an ending to this story for now, I'm going to try a mid-compact DA 9000 crank (riding 40+ miles this afternoon in Lancaster/York counties). First impressions from the stand is the new 9000 crank-set is noisier than the DA-7800. Of course, not an issue on the road. The other thing I did (wrong/incorrectly) was shorten the chain, so I'm a bit nervous. With the 52/36 crank, and pedaling in the 36 up front and 28 in the back, I could hear additional noise in the back - not that the rear derailleur was bouncing off the 28T, just noticeably noisier, kind of a grinding sound. I pushed the hanger adj, B-screw all the way in to push the derailleur off the 28T to no avail... so I cut out a link of the chain. That worked BUT if I use 52 & 28, the rear derailleur is basically a straight line and once stuck the crank, ergh!

Not sure what's next... OTHER than never using 52/28 or even 52/26 combos.

I'm thinking about replacing the rear DA-7800 with a DA-9000 rear derailleur - thinking, well hoping DA-9000 has a longer cage. Does anyone know if that's the case? The DA-9100 rear cage certainly looks longer but it's mounting bolt area seems different than the mount for my DA-7800 derailleur.

Anyway, thank you everyone for helping me. Trent.
Those components should work fine together, with proper adjustment, and chain length.

Time to watch some Park Tool videos, or pay a professional to set it up.
noodle soup is online now  
Old 05-13-20, 09:19 AM
  #24  
Trenton
South, Central Pa rider
Thread Starter
 
Trenton's Avatar
 
Join Date: Aug 2008
Location: Just south of York, Penna
Posts: 32

Bikes: Fuji Roubaix SL 2006, Dura-ace 7800 with Ultegra SL 6600g wheels

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 7 Times in 6 Posts
...new 11s shifters, cassette, chain and a second mortgage. Kidding, the parts are not all that expensive and a fun project next winter.

Thank you for your comments.
Trenton is offline  
Old 05-13-20, 09:25 AM
  #25  
noodle soup
Senior Member
 
noodle soup's Avatar
 
Join Date: Nov 2015
Posts: 7,747
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 3921 Post(s)
Liked 938 Times in 543 Posts
Originally Posted by Trenton View Post
...new 11s shifters, cassette, chain and a second mortgage. Kidding, the parts are not all that expensive and a fun project next winter.

Thank you for your comments.
Just get a new Di2 bike. Problem solved.

In all seriousness, just pay a shop to set up the components you have, and replace the chain if needed. There's no reason why those components you own shouldn't work perfectly together.
noodle soup is online now  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.