I bought a set of carbon fiber cranks on eBay. Well ... they were a bargain. They look very much like Truvativ with an aluminum spider held on with two torx bolts. Really nice carbon work , but absolutely no logos. Go figure.
When I attempted to install them the BB only goes in about 1/4" or so. A Campagnolo BB goes in further but less than half way.
I really like the way these look and I want to use them. Do I have any other options besides filing away at the taper until they fit in the appropriate amount?
Is there something I'm missing in all this, like a Swiss taper BB that everybody knows about but me?
Charles
-- Catamaran racing is like being a kid: Wide Eyes, Big Smile, Wet Bottom
I bought a set of carbon fiber cranks on eBay. Well... they were a bargain. They look very much like Truvativ with an aluminum spider held on with two torx bolts. Really nice carbon work , but absolutely no logos. Go figure.
Quoted message said:
When I attempted to install them the BB only goes in about 1/4" or so. A Campagnolo BB goes in further but less than half way.
Quoted message said:
I really like the way these look and I want to use them. Do I have any other options besides filing away at the taper until they fit in the appropriate amount?
Quoted message said:
Is there something I'm missing in all this, like a Swiss taper BB that everybody knows about but me?
You cannot "file" a hardened precision finished square taper so that it will ever be useful again. First because you can't file it readily but mainly because you cannot replicate the precision of the taper and spindle facets.
You get what you pay for. My quess is that is a factory second that is out of spec. I only know of two common square taper BB. Campy style and Japanese standard. If you tried both you may be out of luck. Since you don't have a company name on the crank who do you call?
<[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
Charles Smith said:
I bought a set of carbon fiber cranks on eBay. Well... they were a bargain. They look very much like Truvativ with an aluminum spider held on with two torx bolts. Really nice carbon work , but absolutely no logos. Go figure.
Quoted message said:
When I attempted to install them the BB only goes in about 1/4" or so. A Campagnolo BB goes in further but less than half way.
Quoted message said:
I really like the way these look and I want to use them. Do I have any other options besides filing away at the taper until they fit in the appropriate amount?
Quoted message said:
Is there something I'm missing in all this, like a Swiss taper BB that everybody knows about but me?
You cannot "file" a hardened precision finished square taper so that it will ever be useful again. First because you can't file it readily but mainly because you cannot replicate the precision of the taper and spindle facets.
You get what you pay for. My quess is that is a factory second that
is out
Quoted message said:
of spec. I only know of two common square taper BB. Campy style and
Japanese
Quoted message said:
standard. If you tried both you may be out of luck. Since you don't
have a
Quoted message said:
company name on the crank who do you call?
I agree that they're probably factory seconds and not properly machined.
However, I recall that some of the old Suntour Superbe Pro cranks had a unique taper that required a unique bottom bracket. Could some of the old Suntour enthusiasts refresh my memory about these?
First I hesitate to disagree with you since you are ... well ... you, and I bought your book when I built my first wheel about 30? years ago. But why? This is aluminum after all. It seems to me in my naiveté that if I take some care with the filing and then torque the thing properly all the high spots will deform and the load will spread and it will work just fine for my little 30 km daily ride. Maybe I should tighten down, once, after I ride it for a while. Not optimal I know but without a precision broach or a NC milling machine ... besides at this point I don't have a lot to lose do I?
Charles
Quoted message said:
Charles Smith said:
I bought a set of carbon fiber cranks on eBay. Well... they were a bargain. They look very much like Truvativ with an aluminum spider held on with two torx bolts. Really nice carbon work , but absolutely no logos. Go figure.
Quoted message said:
When I attempted to install them the BB only goes in about 1/4" or so. A Campagnolo BB goes in further but less than half way.
Quoted message said:
I really like the way these look and I want to use them. Do I have any other options besides filing away at the taper until they fit in the appropriate amount?
Quoted message said:
Is there something I'm missing in all this, like a Swiss taper BB that everybody knows about but me?
You cannot "file" a hardened precision finished square taper so that it will ever be useful again. First because you can't file it readily but mainly because you cannot replicate the precision of the taper and spindle facets.
Get a spindle made for these cranks.
[email hidden]
-- Catamaran racing is like being a kid: Wide Eyes, Big Smile, Wet Bottom
First I hesitate to disagree with you since you are ... well ... you, and I bought your book when I built my first wheel about 30? years ago. But why? This is aluminum after all. It seems to me in my naivet? that if I take some care with the filing and then torque the thing properly all the high spots will deform and the load will spread and it will work just fine for my little 30 km daily ride. Maybe I should tighten down, once, after I ride it for a while. Not optimal I know but without a precision broach or a NC milling machine ... besides at this point I don't have a lot to lose do I?
Quoted message said:
Charles
Cut it out!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
STOP SENDING POSTINGS AS PERSONAL MAIL! I don't care to write personal responses to public messages only to see them again here.
"Charles Smith" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
I bought a set of carbon fiber cranks on eBay. Well ... they were a bargain. They look very much like Truvativ with an aluminum spider held on with two torx bolts. Really nice carbon work , but absolutely no logos. Go figure.
When I attempted to install them the BB only goes in about 1/4" or so. A Campagnolo BB goes in further but less than half way.
I really like the way these look and I want to use them. Do I have any other options besides filing away at the taper until they fit in the appropriate amount?
Is there something I'm missing in all this, like a Swiss taper BB that everybody knows about but me?
Charles
-- Catamaran racing is like being a kid: Wide Eyes, Big Smile, Wet Bottom
Take the crank and the BB to a machine shop and see what they can do.
I would say use the Campag BB(smaller taper in milllimeters) and torque to spec(about 30 ft-lbs) and go ride.
I wonder if they came from a dude called 'Carbonlord', a testy gent if I ever was abused by one.
After looking at the website and a couple of the listings associated with that name, I must admit being rather throroughly underwhelmed. Loads of flash, lots of chest-thumping, but nary a phone number, realworld address, etc. Not my idea of a confidence-building face to present to the customer. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts.
