BB and Crank set up for two6player Dartmoo

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BB and Crank set up for two6player Dartmoo
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flag itsgoku
Posted: Oct 16, 2016 at 20:32 Quote
So im about to purchase my first dj and i do not want to mess up purchasing everything. Since im from america, i dont understand european measurements. I have no clue what size spindle i am suppose to have for my cranks or if i can even run an American bottom bracket. Please help!!
flag cmc4130
Posted: Oct 17, 2016 at 9:56 Quote
itsgoku wrote:
So im about to purchase my first dj and i do not want to mess up purchasing everything. Since im from america, i dont understand european measurements. I have no clue what size spindle i am suppose to have for my cranks or if i can even run an American bottom bracket. Please help!!

You will definitely get a better deal if you buy a complete DJ, rather than building one up. (A custom-build can cost double, even triple the price). But, if you're going to build one up, then keep reading.

You can put BMX cranks on an MTB-DJ, or you can put MTB-Freeride/Downhill style cranks on a DJ. Below, I'll be mostly explaining BMX cranks on a DJ. (Or BMX-style cranks from an MTB brand, like Deity). Profile BMX are one of the most respected brands of cranks in America. They also make it possible to customize your crankset, which you're going to need to do.

Okay, first I'll tell you exactly what to get, then I'll explain why.

1. Go here. http://www.profileracing.com/product/rhd-3-piece-chromoly-race-crankset-2/ .

2. You should be getting either the 170mm or 175mm crank arms (I'd say 170 is more popular these days). The reason I'm telling you to buy the Right Hand Drive (RHD) Race Crankset is that they come with a 19mm spindle, which you need for a Euro bb. If you buy Left Hand Drive (LHD) cranks, it's for people who want their sprocket on the left side on a BMX bike. You do *not* want this for your Dartmoor.

3. Then select the GDH (Gun-Drilled Hollow Chromoly) 6 inch spindle/axle. The reason you're getting the 6 inch one is because it's for a mountain bike and the chainstays are often spaced wider. Most BMX bikes would use the 5.75" one. And most BMX cranksets come with spindles that are shorter than 6 inch.

4. Now go here: http://www.profileracing.com/product/euro-internal-bottom-bracket/ You should pick the 73mm bb shell option. What this means is that they're going to include the correct tube spacer (size 53mm) to go with the 73mm bb shell. If you just bought an off-the-shelf bmx Euro bottom bracket, it's going to come with a 48mm tube spacer, which is intended for BMX bikes (and some DJ bikes) that have 68mm bb shells.

5. While you're at it, you might as well buy a sprocket from Profile. For the Dartmoor, you'll probably want to run gearing such as 28/13. So, I'd recommend getting a 28t sprocket.


YOU'RE DONE.
----------------------------

Background:

(It may sound strange, but the term "American" bottom bracket and "Euro" bottom bracket have almost nothing to do with being from America or Europe--at least not in recent times. It probably dates way back to bicycles in the 1960's.
Most better BMX bikes after the mid 2000's stopped using American bottom brackets, even in America. So, on your current BMX, you probably have a "Mid" bottom bracket.)

The easiest way to recognize a frame that requires a Euro bottom bracket is that the frame has threading inside the bottom bracket shell. You screw the bearing cups in. With all the other bb's, you press them in (no threading).

So . . . . according to the Dartmoor website, you're going to need a Euro bottom bracket for a frame that has a bottom bracket shell that is 73mm wide (instead of 68mm wide).

http://dartmoor-bikes.com/hardware/dirt-street/two6player

Frame size: Short, Long.
Wheel size: 26".
Recommended fork travel: 90-130mm.
Hub size: 135x10mm.
Headset type: EC34/ZS49 or EC34/EC49.
BB type: Euro 73.
Brake mount: IS.
Max.rotor size: 160mm.
Front derailleur compatibility: no.
Seat post diam.:27.2mm.
Seat clamp diam.: 31.8mm.
Weight: Short - 2.16kg, Long - 2.21kg.

You can buy an internal Euro bottom bracket like the Odyssey Euro bb. http://www.odysseybmx.com/catalog/bottom-bracket/euro-bb/ or the

Unsecure image, only https images allowed: http://www.odysseybmx.com/dailyword/archivesV2/2011/02/euro-bb_6814.jpg
HOWEVER, and this is where things get a little tricky, a typical BMX Euro bottom bracket, like the Odyssey one, will ususally come with just the 48mm tube spacer, which is designed for a frame with a 68mm wide bottom bracket shell. You actually need a 52mm tube spacer to go with a 73mm bottom bracket shell.

See how he's (sloppily) measuring this shell? (It's obviously narrower than 73mm).

photo

A internal Euro bottom bracket is going to look like this. That's the tube spacer in the middle.
Unsecure image, only https images allowed: http://www.tredz.co.uk/prodimg/59650_1_Zoom.jpg

Unsecure image, only https images allowed: http://p.vitalbmx.com/assets/images/product_guide/bottom_brackets.jpg
https://www.pinkbike.com/forum/listcomments/?threadid=174145&pagenum=1

https://www.pinkbike.com/forum/listcomments/?threadid=145972

 


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