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Bottom Bracket Help

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flag Jaaaaaaaames
Posted: Mar 20, 2013 at 9:39 Quote
I've got a Spank Tweet Tweet frame with a 73mm English bottom bracket shell. All the cranks I've found that come with a bottom bracket come with a Euro 68mm. Will these fit?
flag cmc4130
Posted: Mar 20, 2013 at 13:06 Quote
Jaaaaaaaames wrote:
I've got a Spank Tweet Tweet frame with a 73mm English bottom bracket shell. All the cranks I've found that come with a bottom bracket come with a Euro 68mm. Will these fit?

68 and 73 refer to the shell width. Normally a 48 tube spacer is used with 68 and a 53mm tube spacer is used with 73. Other than using a different tube spacer the bb is the same.

You could use a regular Odyssey bmx euro bb, for example, if you are going to run 19mm-spindle bmx-style cranks, like Profile, etc. You'll just need to check with your local bike shop for a 53 (or 52.7mm) tube spacer. They commonly have extra spacers.

ALSO, you may need to run a 6" spindle rather than a 5.75" spindle, if you are using bmx Profile-style cranks. Profile sells the gun-drilled hollow chromoly spindle in 6" length.
See:
http://www.profileracing.com/estore/product.php?productId=343

I had to get one of these for both my Blackmarket Mob and my Blackmarket Killswitch, both of which had 73mm shells. A friend of mine also needed it for his Doberman. However, I have been told that some mtb frames with 73mm shells do still work with a 5.75" spindle. The issue is how close the crank arms are spaced to the frrame and will they hit the chainstays.


http://www.evanscycles.com/products/odyssey/euro-bb-ec021294


photo
flag Jaaaaaaaames
Posted: Mar 20, 2013 at 15:23 Quote
cmc4130 wrote:
Jaaaaaaaames wrote:
I've got a Spank Tweet Tweet frame with a 73mm English bottom bracket shell. All the cranks I've found that come with a bottom bracket come with a Euro 68mm. Will these fit?

68 and 73 refer to the shell width. Normally a 48 tube spacer is used with 68 and a 53mm tube spacer is used with 73. Other than using a different tube spacer the bb is the same.

You could use a regular Odyssey bmx euro bb, for example, if you are going to run 19mm-spindle bmx-style cranks, like Profile, etc. You'll just need to check with your local bike shop for a 53 (or 52.7mm) tube spacer. They commonly have extra spacers.

ALSO, you may need to run a 6" spindle rather than a 5.75" spindle, if you are using bmx Profile-style cranks. Profile sells the gun-drilled hollow chromoly spindle in 6" length.
See:
http://www.profileracing.com/estore/product.php?productId=343

I had to get one of these for both my Blackmarket Mob and my Blackmarket Killswitch, both of which had 73mm shells. A friend of mine also needed it for his Doberman. However, I have been told that some mtb frames with 73mm shells do still work with a 5.75" spindle. The issue is how close the crank arms are spaced to the frrame and will they hit the chainstays.


http://www.evanscycles.com/products/odyssey/euro-bb-ec021294

Unsecure image, only https images allowed: http://www.evanscycles.com/product_image/image/b11/066/ff2/45728/product_page/odyssey-euro-bb.jpg

Thanks dude! Massive help!
flag cmc4130
Posted: Mar 30, 2017 at 16:07 Quote
73mm wide bottom bracket shell. Odyssey Euro bmx bottom bracket (internal). 53mm tube spacer. 6 inch spindle.
photo


Note how much narrower the chainstays are on a BMX 24". This is why you can use a shorter spindle on a BMX bike (typically 5.5 or 5.75" spindle) and 68mm bb shell.
photo
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