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Home > Forum > Triathlon Forum > Bike gurus - Bottom Bracket help

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Bike gurus - Bottom Bracket help
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TriKat
Oct 19, 06 16:51
Post #1 of 8 (1106 views)
I'm upgrading my road bike & want to get new 105 cranks (it was really entry level...). How do I know what size bottom bracket to get? These are the choices:

"For 105 splined cranks. Sealed cartridge, tubular splined and without crank bolts. 247g. Specify Model: 68x109.5, 70x109.5, 68x118.5, and 70x118.5"

Can someone translate that for me?
Thanks in advance for your help!
Kathy
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Re: Bike gurus - Bottom Bracket help [TriKat] [ In reply to ]
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sleepy
Oct 19, 06 16:56
Post #2 of 8 (1104 views)
We need to know whether its a double or a triple chainring crankset
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Re: Bike gurus - Bottom Bracket help [sleepy] [ In reply to ]
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TriKat
Oct 19, 06 17:05
Post #3 of 8 (1100 views)
Double - sorry
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Re: Bike gurus - Bottom Bracket help [TriKat] [ In reply to ]
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JacquiAndBoudreaux
Oct 19, 06 17:08
Post #4 of 8 (1094 views)
Is the bike threaded English or Eye-talion? Most bikes these days are English. 68x109.5 is the English double. 70x109.5 is the Eye-talion.
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Re: Bike gurus - Bottom Bracket help [TriKat] [ In reply to ]
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Bob Loblaw
Oct 19, 06 17:13
Post #5 of 8 (1087 views)
Are you doing the work yourself, or having a shop do it?

If you're doing it yourself, easiest way is just to take out the bottom bracket currently on and seeing how much info is written on it, could be all the info is on it right there.

-charles
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Re: Bike gurus - Bottom Bracket help [Bob Loblaw] [ In reply to ]
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TriKat
Oct 19, 06 17:22
Post #6 of 8 (1079 views)
I'm doing it myself with the aid of a friend as a learning experience. I considered doing that, but figured I'd ask the experts here first!
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Re: Bike gurus - Bottom Bracket help [TriKat] [ In reply to ]
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ssDirk
Oct 19, 06 17:49
Post #7 of 8 (1061 views)
a great way to learn...that's how i learned too.

jacki&boudreaux are correct - chances are it's english - 68x109.5. good luck!
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Re: Bike gurus - Bottom Bracket help [TriKat] [ In reply to ]
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JasoninHalifax
Oct 19, 06 17:58
Post #8 of 8 (1049 views)
Unless your bike was made in Italy, you probably have an English thread BB. It is really easy to install with the correct tools, just remember that the right-side cup is reverse threaded on English BBs and normal thread for Italian.
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