Compatibility [10] Bottom brackets - article comments

BikeGremlin

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To prevent article pages from being miles long, but preserve all the useful questions and answers provided over time, I've decided to copy/paste the website comments to the forum - and "move" further discussions here.

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Compatibility [10] Bottom brackets
 
  1. Nick gull
    29/09/2019 at 10:40
    Hi does anyone know what cranksets will fit a shimano BB70 bottom bracket please. Im really stuck in finding information that will help me decide what cranks to buy.
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      Relja
      29/09/2019 at 16:53
      That is Hollowtech II BB, right?
      In that case, the options are:
      – Square taper BB installation and square taper cranks.
      – Octalink BB installation and Octalink cranks.
      – Hollowtech II (as the noted BB70) BB and cranks with a spindle width of 24 mm, including of course the Hollowtech II cranks.
      – Special BB that allows for 30 mm wide spindle to use with BB386EVO and BB392EVO.
      So, in addition to the above noted, cranks that can fit are:
      Race Face X-type, FSA MegaEXO, Truvativ/SRAM Giga X Pipe (GXP), Campagnolo Ultra Torque.
      – As long as a compatible BB cartridge is used.
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    Alex Reid
    28/03/2021 at 13:39
    Hello I’d like to know if there is any possible way of using my sram sx powerspline cranks on a shimano hollow tech II bottom bracket, like is there any adapters or anthing I could use.
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      Relja
      28/03/2021 at 13:50
      PowerSpline bottom bracket (Amazon affiliate link) threads into frames with English thread BB shell (like Holowtech 2 BB cups are threaded in).
      In other words, there’s no need for an adapter – Power Spline BB threads right into the frame (unless the frame has some exotic thread).
      It’s not what I’d call a good, high-quality design, but if those are the cranks of choice, that is the BB needed to mount them.
      With a note to mind the chainline. Different BB cartridge axle lengths are suitable for different frames, with different chainlines.
      Bicycle chainline explained
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    Niall
    13/04/2021 at 07:12
    Hi! Thank-you for this wonderful website.
    I have a SRAM Rival 1 42T 11-speed crankset on my bike. Unfortunately I damaged it and need to replace it. The bottom bracket is an FSA Mega EVO which is a threaded bottom bracket that meets the BB386EVO standard. SRAM offers their cranks in two standards: BB30 and GXP. From your helpful tables I deduce that I need to order the BB30 crankset to work with the BB386EVO bottom bracket. Is this correct? Any advice? Thanks in advance.
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      Relja
      13/04/2021 at 08:28
      Hi,
      BB30 cranks should fit BB386EVO BB, if the spindle length is matching.
      I’d check with SRAM to be sure if it fits. They might need the info on the frame’s BB shell width (left-to-right width, not the circle diameter), and the rear chainline of the bike.
      But if you have a threaded bottom bracket, you could go with a threaded SRAM GXP BB, and GXP cranks.
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    Marko
    15/04/2021 at 00:07
    Can I just replace spindle length on the Cannondale Hollowgram SiSL2 Crankset BB30 to fit on BB30a. Or is there an easier/better way?
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      Relja
      15/04/2021 at 07:05
      Hi Marko,
      For all I know:
      Spindles are not replaceable on a vast majority of cranks, so I’d be amazed if that were possible.
      But you should be able to fit BB30 cranks on a BB30A frame if the cranks have some spacers (that should be removed in order to fit on the BB30A frame).
      Relja
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    Kevin Masaki Yang
    16/08/2021 at 04:56
    Hi does anyone know if PF30 Outboard ABEC-3 BB for 24mm Cranks (Shimano) – Black will work with a DURA-ACE – Dual-Sided Power Meter on a frame that supports PF30?
 
  1. Kevin Taylor
    04/10/2021 at 14:30
    Hi There I am riding a Specialized Sirrus X 5.0, and the current bottom bracket is a Praxis 68-0201B , 68mm BSA , with Praxis Alba Crankset 1 X 11.
    I have purchased a Shimano GRX 810 Gravel 1 X 11 that runs on Hollowtech 11 bottom bracket.
    Looking at changing BB to XT MT800 sized 68/73mm – English Thread – 24mm or the SHIMANO XTR M9000/9020/980 THREADED BOTTOM BRACKET.
    Question i’m asking, does either of these BB fit my current frame and are compatible with the GRX Crankset
    Or what Bottom Bracket do i need to fit the Sprcialized frame, as the current bottom bracket has not much detail stamped on it, i believe it is a Praxis one though.
    Any advice on this would be greatly received.
    Regards
    Kevin Taylor
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      Relja
      04/10/2021 at 14:47
      Hi Kevin,
      Short answer: yes, either should work.
      Long answer:
      In terms of the BB fitting the frame:
      You have a 68 mm BSA bottom bracket, so your frame uses the British standard threaded bottom brackets (and is most probably 68 mm wide).
      Hence – any BB that has the British standard thread should screw in without problems.
      Now, many BBs are designed to work with both 68 and 73 mm wide frames, but not all – check before buying.
      In terms of the BB fitting the cranks:
      Any Shimano Hollowtech II compatible BB should work.
      A budget option is Shimano Tiagra BB-RS500.
      Relja
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    Steve Widmayer
    24/10/2021 at 19:13
    Enjoying reading your site…very informative. I have the following BB Compatibility question. I’m updating the BB’s (tapered steel spindles w/ caged bearings) on two of my 1980’s steel frame rides, one a two-chainring road bike & one a 3-chainring tour bike. I want to replace with the more current threaded, tapered spindle, cartridge/sealed bearings. The two spindles are “eccentric”…each has a longer dimension(on the right/drive side) from the bearing surface than the left side. From all the info/specs I’m finding, none of the offerings spec an eccentric spacing, just the overall length (such as Shimano UN300). I think the original idea was to allow for specific chainline alignment. Will any of these products work without chainline “problems”. Thanks for your input.
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      Relja
      24/10/2021 at 21:17
      Hi Steve,
      In my experience, the first thing to pay attention to is the frame’s BB shell threading standard. Making sure which one it is, before trying to screw anything in. I know it may sound silly, but I think it’s worth stressing for anyone reading this.
      The article “Vintage bicycle frames with modern parts” deals with this in great detail.
      As for the cartridge bottom brackets – all the spindle eccentricity is dealt with within the enclosed mechanism, so it is less plain to see, but it still exists.
      Unfortunately, it’s difficult to know upfront which length will be the optimal choice. For all I could try, it still boils down to trial and error. I make sure to always have the entire range of lengths in the shop and am happy to do test-mounting to confirm, starting with the length I expect to be the optimal choice first.
      At the end of my bicycle chainline article, there’s a chart that gives some left and right eccentricity data, but it won’t help much. Many cup and cone axles (spindles) have a slightly different taper compared to Shimano’s cartridge BB square spindles. That’s mentioned in my threaded bottom bracket standards article – chapter 4 (JIS and ISO standards for the taper slope).
      So it’s mostly eyeballing and trial and error. Some very rough guide (what I often try with first) would be:
      110 mm spindle for singlespeed cranks.
      113 to 115 mm spindle for double cranks.
      120 to 128 mm spindle for triple cranks.
      Maybe this isn’t much of a help, but it’s the best I can do. Coming up with a system to know upfront which spindle length fits best would save me a lot of time and hassle, but I still haven’t managed to do that. I get it right from the first time about 50% of the time, and from the 2nd try (with a longer spindle most often) about 40% of the time. But sometimes it takes 3 tries to get it right. On the upside – it is quite a Zen-like procedure, no-hassle once the old BB has been removed. 🙂
      Relja
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    Steve Widmayer
    26/10/2021 at 05:38
    Relja…thanks for your prompt & thoughtful reply, very helpful. I never thought that BB’s would be such a problem…but eventually I think I’ll be able to work out a solution. IRD does list a spindle selection that includes the cups and 1/4″ caged bearings and shows the asymmetrical spindle with left/right “offsets”… that may be the best solution, although more expensive than their cartridge bearing alternative. Thanks again…your site is very helpful!
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    Vendmerc
    28/10/2021 at 08:19
    Hi i have a road bike with BB72-41B road bike BOttom bracket. I believe this is an ultegra
    My question is can I install a BB71-41A (deore) or a mt800 (xt) BB on a 105 crank? Seems like they have same specifications except the inner sleeve width? Will they fit if i dont use the inner sleeve? (sealed frame)
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      Vendmerc
      28/10/2021 at 08:20
      Both press fit
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      Relja
      28/10/2021 at 09:08
      Hi Vendmerc,
      Based on Shimano’s specs, the BB71-41A is too wide – designed for 89.5mm and 92mm wide frame bottom bracket shells.
      Road bike cranks generally work with 68 to 73 mm wide frames.
      The Deore BB, model BB-MT800 (XT M8000 Series) should fit road frames and cranks fine.
      Generally speaking – for the 105 cranks, it is important that BB is for Hollowtech II, and that its width matches the frame (probably 68 mm, but, as I like to say: “one good measurement is better than a thousand expert opinions”). 🙂
      Relja
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    Rust
    27/12/2021 at 12:26
    Hey, I have a road bike with a BB30 Bottom Bracket I was wondering if Hollowtech II Cranksets. The bike is a Specialized Allez Sprint
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      Relja
      29/12/2021 at 08:47
      Hi Rust,
      There is enough room for a 24 mm in diameter Hollowtech II axle inside the BB30 brackets and bearings. But you need an adapter.
      Here’s an Amazon affiliate link for a BB30-Hollowtech II adapter.
      I suggest you look for an adapter in a local bicycle shop – keeping them in business and keeping a good relationship with LBS-s is priceless.
 
Metin
05/09/2022 at 21:12
Hi Relja,
I have a question, I have TruVativ FC-E350-A1 and this cranksets have a power spline and Square BB compatibility i want to change that crankset but i can’t find the compatibility list or something. This crankset is compatible with 3×8 derailleur and i need 3×8 comp. crankset,
So which crankset is ok with my bike’s BB?
Is shimano Acera FC-M361 48X38X28T crankset ok for me? or which is the best Shimano crankset is comp. with my BB?
If you answer my question im really glad for that thanks for now.
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    Relja Novović
    06/09/2022 at 07:19
    Hi Metin,
    Generally:
    Shimano Acera FC-M361 works with square taper bottom brackets.
    If your bottom bracket isn’t a square taper one, you’ll need a square taper bottom bracket (122.5 mm long spindle, in most cases, for that model of cranks – for details on this see my bicycle chainline article).
    Regarding the number of speeds, you can also use 7-speed, or 9-speed cranks, they will most likely work fine (noting this because of the parts shortage, in case you can’t source 8-speed cranks).
 
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