Yet Another Cycling Forum

General Category => Freewheeling => Folders => Topic started by: Oxford_Guy on July 05, 2017, 07:01:29 pm

Title: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on July 05, 2017, 07:01:29 pm
I love my 2017 Superlight Brompton, but not so keen on the stock bottom bracket and would also like to shave more weight off. I've read that some use a Specialites T.A. Axix Light Bottom Bracket, will this fit a 2017 Brompton and have keep the correct chainline? If so, which size do I need? Was assuming 119mm and BSA (1.37x24) thread? It's expensive, but I understand has replaceable bearings.

Phil Wood does very nice bottom brackets, but then the price does start to get silly...
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on July 05, 2017, 08:48:04 pm
I think modern Bromptons require a JIS BB taper, but not sure if T.A. Axix is JIS or ISO...
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: LittleWheelsandBig on July 05, 2017, 08:55:55 pm
Current B cranks are JIS, earlier are ISO. Most French BBs should be JIS or an approximation thereof. Few manufacturers tightly match a specific BB standard, tending to have a proprietary standard that is close to one or the other.
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on July 05, 2017, 09:04:11 pm
Okay, thanks. There's also this (https://www.sjscycles.co.uk/bottom-brackets/ti-parts-workshop-sealed-titanium-bottom-bracket-w-japanese-bearings-1185-mm-silver/ (https://www.sjscycles.co.uk/bottom-brackets/ti-parts-workshop-sealed-titanium-bottom-bracket-w-japanese-bearings-1185-mm-silver/)) Ti Parts Workshop Brompton-specific lightweight bracket, seems to have decent sealed bearings, but when I asked the manufacturer if the bearings are replaceable they said ""sorry, we don't suggest customers change the bearing by them self or any bike shop. But you can send the products back to us for repair", whereas I know the T.A. Axix Light bearings can be user replaced...
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: rogerzilla on July 05, 2017, 09:26:45 pm
TA Axix is JIS. I have one in the Fuji Track.  It's light but not very heavy duty.
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on July 05, 2017, 09:40:42 pm
TA Axix is JIS. I have one in the Fuji Track.  It's light but not very heavy duty.

Thanks. BTW I'm only 70Kg and more of a "spinner" than a "masher", so maybe that helps...
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on July 05, 2017, 11:02:19 pm
Apparently it's possible to get a Royce bottom bracket that will fit a Brompton, now *that* I would be interested in...
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on July 06, 2017, 01:55:47 pm
Another potential issue with using a non-stock BB is whether you can get them with an asymmetric spindle, as the drive-hand side is about 8mm longer (I haven't measured this precisely)
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Jurek on July 06, 2017, 02:20:34 pm
It's not necessarily an issue if you are using HTII - On my Alfine chainset I've had to mount the chainring on the outside of the spider in that the chainring clears the rear triangle, and the correct chainline is maintained.
As it is, there's a gap of probably less than 2mm between the rear chainring bolts and the triangle.
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on July 06, 2017, 07:06:59 pm
It's not necessarily an issue if you are using HTII - On my Alfine chainset I've had to mount the chainring on the outside of the spider in that the chainring clears the rear triangle, and the correct chainline is maintained.
As it is, there's a gap of probably less than 2mm between the rear chainring bolts and the triangle.

Sure, but I'd prefer to stick with a square taper BB
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: chagzuki on July 07, 2017, 09:01:56 pm
AFAIK the TA axix BB is neither JIS nor ISO but somewhere in between so as to fit both.
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on July 08, 2017, 10:43:50 am
AFAIK the TA axix BB is neither JIS nor ISO but somewhere in between so as to fit both.

Okay, thanks
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: PaulM on July 19, 2017, 05:56:04 pm
I've been using an Axix Light BB with JIS taper cranks. Any idea how to removed the bearing from the spindle? I have a rough bearing and am struggling to get it off the spindle. Is there some kind of bearing puller that will do this?
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: rogerzilla on July 19, 2017, 09:26:21 pm
Any small 3 arm puller should work.
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: PaulM on July 27, 2017, 08:12:33 am
Thanks. I've bought one, but not used it yet.
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on August 22, 2017, 01:31:45 pm
In the end I installed a Royce bottom bracket, it's lovely and smooth:

(http://i.imgur.com/ABZl3mQ.jpg)

Might look better if I add a lockring to the non-drive side:

(http://i.imgur.com/KOjRpvb.jpg)

(http://i.imgur.com/pPGHrvz.jpg)
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: rogerzilla on August 22, 2017, 09:09:58 pm
I have a Shimano UN55 in each of mine, having had "fun" removing stuck FAG BBs before.  I feel guilty now because I then went and fitted the barely-used FAG BB in SO's bike.  Mind you, as the bike will live on the streets of Oxford, it may well be stolen well before the BB needs changing.
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on August 22, 2017, 09:40:39 pm
I have a Shimano UN55 in each of mine, having had "fun" removing stuck FAG BBs before.  I feel guilty now because I then went and fitted the barely-used FAG BB in SO's bike.  Mind you, as the bike will live on the streets of Oxford, it may well be stolen well before the BB needs changing.

I live in Oxford too, but try not to leave the bike on the street!
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Torslanda on August 28, 2017, 09:45:29 am
My understanding of Royce is that both cups have lock rings in order to precisely adjust the chainline. You need them both - unless the cups are so tight they're never going to move...
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Oxford_Guy on August 28, 2017, 03:26:32 pm
My understanding of Royce is that both cups have lock rings in order to precisely adjust the chainline. You need them both - unless the cups are so tight they're never going to move...

I was told (by Cliff at Royce) that the lock rings are not necessary and mostly cosmetic, also as I have a double width spacer on the driver-side cup, there is no exposed thread for the lock ring on that side
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: LittleWheelsandBig on August 28, 2017, 03:44:01 pm
Phil Wood BBs don't have lockrings or shoulders on either cup. It wouldn't be surprising if Royce BBs didn't actually need them either.
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: Torslanda on August 28, 2017, 05:19:40 pm
I ain't dead arguing with Royce...
Title: Re: Will a Specialites T.A. Axix Light Bottom Bracket fit a 2017 Brompton?
Post by: chagzuki on November 03, 2017, 09:05:59 pm
Does anyone have any experience with the TA axix, going back to the original question?
I happen to have one with a 119mm spindle but I suspect it'll be too short if the taper is not quite JIS.