(Another) Question about spindle lengths and BB
09-30-12 | 04:01 PM
#1
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(Another) Question about spindle lengths and BB
Hi,
I am looking into getting a new BB and I'm getting a bit confused with the measurements. From what I understand the BB size is the width of the BB as well as the length of the shaft that sits inside it. I measured the spindle length of my current BB and it is 135mm! I did the measurement again and got the same answer, but this seems to be 10-20 mm too long. I then looked up my current crank specs here:
https://velobase.com/ViewComponent.as...5-58afeeae114e
and it says BB length is 117. I don't get how this can be. The BB and crank are stock with the bike as far as I know (I bought it 2nd hand)
/HKL
I am looking into getting a new BB and I'm getting a bit confused with the measurements. From what I understand the BB size is the width of the BB as well as the length of the shaft that sits inside it. I measured the spindle length of my current BB and it is 135mm! I did the measurement again and got the same answer, but this seems to be 10-20 mm too long. I then looked up my current crank specs here:
https://velobase.com/ViewComponent.as...5-58afeeae114e
and it says BB length is 117. I don't get how this can be. The BB and crank are stock with the bike as far as I know (I bought it 2nd hand)
/HKL
09-30-12 | 04:09 PM
#2
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
If your spindle is solid and takes nuts, you might be measuring the total length, and not just to the ends of the sq. taper, which is the correct spec.
Since the screw studs are about 10mm tall, that may be the difference. In any case reconfirm, measuring to the ends of the taper.
BTW- 135mm (or so) spindles aren't all that rare, at least on older bikes. Search through Sheldon Brown's spindle length chart and you'll see them listed.
Since the screw studs are about 10mm tall, that may be the difference. In any case reconfirm, measuring to the ends of the taper.
BTW- 135mm (or so) spindles aren't all that rare, at least on older bikes. Search through Sheldon Brown's spindle length chart and you'll see them listed.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
09-30-12 | 04:12 PM
#3
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From: Shady Pines Retirement Fort Wayne, In
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Do you have a nutted spindle? If so are you measuing the stud? A pic is worth a thousand words, post a pic of the spindle with your calipers.
But in answer to your question Yes. The first two measurements pertain to your bike 36x24 would be Italain threading in a 70mm shell. 1.37x24 would be English at 68mm ( and some early MTBs with a 73mm shell) and the the third number is the spindle 36x24, 117 or 1.37x24 x 113.
Your crank isn't a triple is it?
But in answer to your question Yes. The first two measurements pertain to your bike 36x24 would be Italain threading in a 70mm shell. 1.37x24 would be English at 68mm ( and some early MTBs with a 73mm shell) and the the third number is the spindle 36x24, 117 or 1.37x24 x 113.
Your crank isn't a triple is it?
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk
09-30-12 | 11:35 PM
#4
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From: Mesa, AZ
Bikes: Moots RCS, tandem, beach-cruiser, MTB, Specialized-Allez road-bike, custom track-bike
Hi,
I am looking into getting a new BB and I'm getting a bit confused with the measurements. From what I understand the BB size is the width of the BB as well as the length of the shaft that sits inside it. I measured the spindle length of my current BB and it is 135mm! I did the measurement again and got the same answer, but this seems to be 10-20 mm too long.
I am looking into getting a new BB and I'm getting a bit confused with the measurements. From what I understand the BB size is the width of the BB as well as the length of the shaft that sits inside it. I measured the spindle length of my current BB and it is 135mm! I did the measurement again and got the same answer, but this seems to be 10-20 mm too long.
Measuring with bolt-type hollow BB-spindles:
https://thebikestand.com/campy-spindles.jpg
Simple way with both is to install the nut/bolts and measure the inner distance:
https://thebikestand.com/vint-C-spind...0-zw-bolts.jpg
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