Changing Crankset to a midcompact
Hello people,
I am very close to ordering a bikes direct Titanium bike that comes with Ultegra 6800 parts, except for the crankset which is a Compact Double 50x34T FSA. I have decided I want a matching Ultegra crankset instead so will order that. However, I want a semi-compact (Mid-Compact) 52/36 crankset instead. My question is this: Do I need to also get a matching Ultegra bottom bracket or can I keep the FSA one that comes with the bike. Secondly, do I also need to get another chain since I am changing from a 50x34 Compact to a 52/36 Semi-Compact crank. And finally, would I need to change the derailleurs? Any help or advice is greatly appreciated. I don't want to order a $200 crankset and then I can't use it. Thanks in advance! Below are the specs of the bike I am ordering (and which I want to replace with a mid-compact Ultegra crank) Crankset - FSA N11, Gossamer Compact 50x34T, HG C-Ring , W/ ALLOY BLK ANOD. CTL Crank 170/172.5/175mm for 50-53/55/58-61CM Bottom Bracket - FSA BB-6200 MEGA EXO BB (68mm) Front Derailleur - SHIMANO FD-6800 ULTEGRA FOR FRONT DOUBLE & REAR 11-SP BAND TYPE(31.8MM) Rear Derailleur - SHIMANO RD-6800, ULTEGRA GS 11-SP, COMPATIBLE 28-32T FOR DOUBLE Shifters - SHIMANO SHIFT/BRAKE LEVER, ST-6800, ULTEGRA Cassette/Freewheel - SHIMANO CASSETTE, CS-6800, ULTEGRA, 11-S, 11-12-13-14-16-18-20-22-25-28-32T Chain - SHIMANO BICYCLE CHAIN CN-HG701-11, FOR 11-SPEED |
The FSA BB would not be compatible with 6800. You'll need to remove (unscrew) the FSA megaexo BB and fit any Shimano Hollowtech 2 BB (Tiagra,105,Ultegra,Dura Ace) to work with the 6800 crank.
The chain might not need changing either. It all depends how much it was shortened when it was installed. Alot of times, factory bikes come with chains that are too long. So you might be good. I would try it first. Before spending money. If the chain is too short. Only the big/big combo would likely be unusable. That combo is easily avoided. Even if its temporary until you buy a new chain. All the others parts will work fine. They do not need changing. The FD may need to be re-positioned higher to clear the 52t chainring. |
Originally Posted by trailflow1
(Post 19638329)
The FSA BB would not be compatible with 6800. You'll need to remove (unscrew) the FSA megaexo BB and fit any Shimano Hollowtech 2 BB (Tiagra,105,Ultegra,Dura Ace) to work with the 6800 crank.
The chain might not need changing either. It all depends how much it was shortened when it was installed. Alot of times, factory bikes come with chains that are too long. So you might be good. I would try it first. Before spending money. If the chain is too short. Only the big/big combo would likely be unusable. That combo is easily avoided. Even if its temporary until you buy a new chain. All the others parts will work fine. They do not need changing. The FD may need to be re-positioned higher to clear the 52t chainring. What do you mean by "big-big" combo though? |
Big/Big means using the big chainring in combination with the big cog on the cassette (cross chaining). When doing so, the chain is at an extreme angle and the RD cage will be at its maximum extension. If the chain is too short and the RD cage is fully extended and cannot spring back. Spinning the cranks in this combo will tighten up the drivetrain/chain and it will make alot more noise, worst case scenario it will lock up the drivetrain or at least make the chain hard to turn. That's how you will know the chain is too short. So it's best to check it while in the workstand beforehand. Not out on the road.
Big/big is not a combo that should ever be used for long periods. or ever if yuou can help it. Because it causes premature wear of the chain. And it is the noisiest gear combo. But the chain still needs to be the correct length if you ever do click into that combo by accident. |
Originally Posted by trailflow1
(Post 19638329)
The FSA BB would not be compatible with 6800. You'll need to remove (unscrew) the FSA megaexo BB and fit any Shimano Hollowtech 2 BB (Tiagra,105,Ultegra,Dura Ace) to work with the 6800 crank.
The chain might not need changing either. It all depends how much it was shortened when it was installed. Alot of times, factory bikes come with chains that are too long. So you might be good. I would try it first. Before spending money. If the chain is too short. Only the big/big combo would likely be unusable. That combo is easily avoided. Even if its temporary until you buy a new chain. All the others parts will work fine. They do not need changing. The FD may need to be re-positioned higher to clear the 52t chainring. |
That's an option. Some people do that and get on fine, 1 Quick link will be fine but a 2nd i think would add another weak point to the chain. Quick link are not as strong as proper links and can fail sometimes. I've witness both KMC and Sram links do it. So you kinda increase the chances of link failure the more you add. That's just my view. I suppose it all depends how much you trust those extra quick links. If you were to do it. I wouldn't join two together at the same spot if two were needed. I'd put them a good distance from each other.
Trouble is, quick links can be expensive when bought separately. It can be more economical to buy a chain that includes a quick link. |
Originally Posted by trailflow1
(Post 19638517)
That's an option. Some people do that and get on fine, 1 Quick link will be fine but a 2nd i think would add another weak point to the chain. Quick link are not as strong as proper links and can fail sometimes. I've witness both KMC and Sram links do it. So you kinda increase the chances of link failure the more you add. That's just my view. I suppose it all depends how much you trust those extra quick links. If you were to do it. I wouldn't join two together at the same spot if two were needed. I'd put them a good distance from each other.
Trouble is, quick links can be expensive when bought separately. It can be more economical to buy a chain that includes a quick link. |
Originally Posted by Sy Reene
(Post 19638492)
Not sure 'by the book' if one could determine how short the chain is if the original chain was sized correctly, but is it an option for the OP to get 2 or 3 quicklinks to extend his chain length?
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Originally Posted by Sy Reene
(Post 19638643)
A 6-pack of 11s KMC missing links goes for about $15, so I guess it depends.
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1 Attachment(s)
Originally Posted by DrIsotope
(Post 19638826)
I've never found the 11-speed links available for less than $6 each from US sellers. I've seen 4-packs from the UK/Asia for $20, if willing to wait a few weeks for them to arrive. Two fifty a link sounds pretty great.
Anyway, it was actually $16 for 6. |
It must have been awhile ago, because 6-packs on Amazon and eBay are now around $30... unfortunately.
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Originally Posted by DrIsotope
(Post 19638841)
It must have been awhile ago, because 6-packs on Amazon and eBay are now around $30... unfortunately.
https://www.amazon.com/KMC-Missing-L...d+missing+link |
Yeah, it's definitely a kick in the ass. I got an early Father's Day gift-- upgrade to 11-speed. The parts themselves was around the same or even cheaper in some instances compared to my Shimano 10-speed group, but the price of quick-links from SRAM, KMC, and FSA are nuts. Even on Amazon, usually around 8 bucks apiece. Wipperman/Connex makes a reusable 11-speed link that goes for $25-30.
And as I just started experimenting with hot wax for my chain, I either need a line on cheaper quick links, or to knuckle down and buy the criminally-priced Wipperman. |
Originally Posted by trailflow1
(Post 19638329)
Only the big/big combo would likely be unusable. That combo is easily avoided.
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