RADBMX.CO.UK
Technical & Reference Section => Tech and Restoration => Topic started by: winnit93 on January 30, 2008, 12:35 PM
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ive just got the titan mini frame through from steve first thing i need to sort out is this weird bb size.
the hole on the frame is 38mm with cups that would take bearings 34mm.
this is a new one on me so can anyone shed any light on it and point me in the right direction :daumenhoch:
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spanish?
american bb without the cups?
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looks to small to be american without cups.
spanish could be right though
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did spanish bb exist in 1982?
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(http://www.radbmx.co.uk/archive/albums/g1/brian4130/misc/DSC00029.jpg)
any help? dims listed are relating to the bearings.
Bp :daumenhoch:
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i think spanish are the last 10 years invention.
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Brian.....i think that's my BB :daumenhoch:
i thought all mini's were euro sized BB?
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:) Don`t Euro B/B`s come in different sizes/threads????
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the actual hole on this frame is 38mm,the outside diameter of the bearing is 34mm
these were very special and very expensive frames,made of titanium and arc welded under water :shocked:
dont think titanium was used on any other bmx bikes then.
even the headset's are different bloody 7/8 on these
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the inside diameter of a euro BB shell is 34mm but the bearing will be smaller than that depending on what size cups you use
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Do you have the cups still? If you do, what is the OD of the cup?
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Do you have the cups still? If you do, what is the OD of the cup?
yes mate i have the cups o/a size is 39mm on the back of the cup
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Do you have the cups still? If you do, what is the OD of the cup?
yes mate i have the cups o/a size is 39mm on the back of the cup
Are the cups threaded?
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NO!
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I have no idea either then.
Those cups should take normal euro sized bearings, but I have no idea what the cups are ? ??? :-\
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Really quite odd, but I guess custom made for Titan jr's?
http://bmxmuseum.com/bikes/titan/1858
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Brian.....i think that's my BB :daumenhoch:
lol, sure is bud! :daumenhoch:
i think spanish are the last 10 years invention.
yeah they were developed by Fly Bikes, hence the "spanish" bit, but i'm sure there have been quite a few different variants out there at some stage.
I have no idea either then.
Those cups should take normal euro sized bearings, but I have no idea what the cups are ? ??? :-\
Hey if the cups aren't threaded, isn't there another setup which is kinda like the profile evolution BB that actually threaded into itself from each side?
IASC or something???
Google time, I reckon...
Brian :daumenhoch:
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Have a look on sheldonbrown.com
tons of info there :daumenhoch:
def a weird size BB :-\
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Have a search for 'Threadless Bottom Bracket', that is the kind that threads to itself. I know YST do one but I am unsure of the sizes.
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(http://www.radbmx.co.uk/archive/albums/v665/winnit93/c26e_12.jpg)
this is a 1985 model but even this looks smaller than the one i have
this is mine
(http://www.radbmx.co.uk/archive/albums/v665/winnit93/tit2_lg.jpg)
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I saw that one as well and assumed the other was the same size - but as you've shown, it's not.
I definately have no clue and Sheldon Brown's website can't help either :-\
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im gonna pop round to keswick mountain bikes see if they know what the fook it is :LolLolLolLol:
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Pop down to a bearing shop and see if they can get a match for you :daumenhoch:
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Pop down to a bearing shop and see if they can get a match for you :daumenhoch:
ye thats the next step ive a ti spindle coming so i can get a bearing to fit
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Pop down to a bearing shop and see if they can get a match for you :daumenhoch:
ye thats the next step ive a ti spindle coming so i can get a bearing to fit
Steve is selling the BB that came with it in the For Sale section "half price to the buyer of the Titan" or words to that effect :daumenhoch:
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the reason why the bb ismt a standard size, is that it titanium tubeing
note, the smmooth bb i have came with the powerlite i buyed
note the bearings will be imperial, not metric
the spingle is.62 of an inch
15.90mm
-say 16mm
so you need to go 16mm to the id of the cups the bearings need to be as wide as the cups
note, a eurobb wont fit cos ti isnt available that size, or guage to cut a thread in
-us bb size either'
the cup is specufic to a stock size beasring to spindle - else it wouldn't be there - at that size i.d. :LolLolLolLol:
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http://www.midlandbearings.com/6700.htm
the spindle is 5//8ths
15,87mm
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http://www.midlandbearings.com/1600series.htm
probably 5.8ths to 1.3/8ths
#7/16ths widewide
bearing number 1623