I have searched, read, searched some more, and I am still confused. I want to get a crank-based power meter that will fit both my road bike (Giant Defy Advanced) and my future tri bike (Speed Concept, I hope).
Is there a Quark that will fit (with or without adapters) both of these BBs? I believe the Giant is a press fit Mega Exo BB and the Trek is a BB86.5.
Thanks.
Edit: Sorry about the extra thread - I initially thought the Giant was a press fit 30.
so long as it’s not a BB30 or BBright you’ll be good.
I’m pretty sure the Giant is a BB86
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I’m pretty sure the Giant is a BB86
http://www.giant-bicycles.com/en-us/bikes/model/defy.advanced.3.compact/7316/44045/ says “FSA Mega-Exo, Internal Press Fit” but I don’t understand what that ultimately means.
Dan’s article here http://www.slowtwitch.com/Tech/Bottom_Bracket_Standards_2573.html makes clear that it is not BB30, but I don’t quite know what it is.
“And it’s not only Hollowtech. It’s FSA MegaExo, SRAM GXP (an acronym of Truvativ’s Giga-X-Pipe), and every crank and BB that fit into bikes made to accept Shimano components.”
It’s a bb86 press fit that takes different adapters for GXP,Mega Exo or hollowtech.
I have a Giant trinity advanced and researched this, I believe all Giant bikes are BB86 press fit.
Okay, thanks! I sort of get it. So if I get a Quarq that fits BB86/BB90 per their support page, I might just need to get different press in bearings/adapter for the Giant since the crank is supposed to fit both “standards.” Does that sound right?
Yes, that sounds correct.
Yes Giant’s are BB86, but Speed Concept’s have a BB86 for a 7.X and BB90 for a 9.X, but it doesn’t matter. Like I mentioned before, get anything that isn’t BB30 or BBright and you’ll be fine. SRAM GXP, Rotor, FSA Quarqs would all work, you just get the specific BB for the frame they are going into.
You can not adapt a BB30 (and I believe a BBright) crank to fit a BB86/BB90 or traditional threaded BB.
So really it comes down to the Tri frame you end up with, but as long as you get a standard crank, assuming someone doesn’t invent a new BB, there are adapters that will allow it to work.
Okay, thanks! I sort of get it. So if I get a Quarq that fits BB86/BB90 per their support page, I might just need to get different press in bearings/adapter for the Giant since the crank is supposed to fit both “standards.” Does that sound right?
Thanks Greg.
I’ve got a 2012 Trinity Composite 2 and am looking to upgrade the crank. I was wondering if anyone ever tried the solution here and was able to make something work before I spend any money on a crank that I can’t make fit.
As I understand it, the Press Fit MexaExo awkward 19mm spindle is the same size as the BB86? So If I pick up anything that is fit for a BB86, it will fit the Trinity?
Thank youz
As I understand it, the Press Fit MexaExo awkward 19mm spindle is the same size as the BB86? So If I pick up anything that is fit for a BB86, it will fit the Trinity?There is a lot of juxtaposing of terms going on in this thread. MegaExo refers to FSA’s original outboard bottom bracket for framesets with a BSA24 standard (threaded) bottom bracket shell but may also have been used to market FSA’s BB86 or press-fit (PF86) bottom brackets. Next, since you asked specifically about the Trinity, while Trek introduced the BB90 standard, Giant/Scott introduced the BB86/PF86 standard which refers to a press-fit adapter with sealed cartridge bearings pre-installed (pressed) into the adapter which is then pressed into the bottom bracket shell. There are a number of variations that are important to understand - Shimano Hollowtech 2 has a 24mm diameter spindle; SRAM’s GXP, also 24mm diameter drive-side but has a smaller diameter on the non-drive side thus incorporates bearings with different inner-diameters. FSA’s press-fit 86 adapters are somewhat specific to the FSA K-Force and SL-K cranksets, as while the newer Shimano DA/Ultegra cranks with 24mm diameter spindles will work with FSA PF86 and MegaExo bottom brackets, the inverse is not true. FSA’s K-Force Light and SL-K Light variants require FSA specific press-fit adapters because these cranks have a slightly larger diameter spindle which does not work with BB86/PF86 adapters intended for Hollowtech 2 style cranks - okay, to be literal, you cna put the crank in the freezer for an hour and then use a hammer or mallet and a lot of force but does that sound like a good idea to you? So simply put, if you are installing an FSA MegaExo/K-Force/SL-K crankset, you will need an FSA PF86 bottom bracket.