BB adapter choices/ suggestions

[spleeft]

I know this is a newb question and Ive been clicking around the past few days here and on all the BMX manufactures' sites. What are my choices for converting this 49DX BB over to be able to use a cool CNC'd crank set from company's like Profile/ etc? I understand when doing these conversions for klunkers it takes some trial and error so I have a TruVativ American to Euro BMX Bottom Bracket Adaptor on order as a starting point but are there any press in type options out there? And is chainline going to be a problem? The manufacturers dont all give exact measurments, they just say , "fits all American BB"
BB Measurements are ID 51.67mm / width 65.85mm / and a pic of original 1pc with chain ring for chain line reference. Im gonna use a Bendix 2 speed so I guess I should be shooting for a similar chainline to the original.

 

[hamqqea]

Chainline depends on bottom bracket spindle width and cranks mainly. A 125mm BB cartridge type should suffice with a single sprocket crank. Chainline adjustability is limited to the front in cases where the cog is integral to the hub such as the Bendix. Dished coaster cogs available in various depths can be flipped to achieve an ideal chainline.

Popular sealed YST BB for square taper cranks. The spindle can be moved slightly laterally to one side for a proper chainline.

Sealed kit for either 19 and 22mm spindle Redline cranks.

Quite a few options, depends on usage and crank selection. Chainline for single speeds should be straight as possible. Many folks here have done all the above conversions with moderate width tires successfully without too much fuss.

There's a possibility TruVativ type cups may require additional work to fit as in the video. Some BB's have obstacles. Note the manner how the spacers are applied.

 

[whitecoyote]

I just did a conversion on my Worksman and it works great.
I used this from Amazon: https://www.amazon.com/dp/B07MFC51X7?ref=ppx_yo2_dt_b_product_details&th=1
Bottom bracket axle was a 103 so the sprockets would line up.

 

[Wildcat]

I've swapped the chain wheel from inside to outside the crank to get a better chain line.

With the parts you're getting it should work fine. I went el cheapo the first time I did a conversion and it was a big improvement over the original one piece crank.

 

[wheelbender6]

I had bad luck with the type of BB adaptor that has three long screws connecting the 2 sides. The bottom bracket tube on my old western flyer contained a lot of welding flash. I tried to grind down the obstructions with a Dremel and big file, but the three screws were still very difficult to line up, it didn’t stay in adjustment very long,
On my Flightliner, I used the cheaper, simpler adaptor that has no screws. It has worked really well. BB bearings stay in adjustment.

 

[ratcycle]

I've swapped the chain wheel from inside to outside the crank to get a better chain line.
View attachment 180570
With the parts you're getting it should work fine. I went el cheapo the first time I did a conversion and it was a big improvement over the original one piece crank.
View attachment 180569

got a link where one could get this type conversion, or the non screw one