Odd bottom bracket bearing issue...

Spanish only refers to the outer diameter. The inner diameter stays the same (19mm is still 19mm, 22mm is still 22mm.)

Sounds like defective/wrong bearings to me. What brand are they? I'd try to stick with well known BMX brands, though I know not many offer Spanish any more.

Also, do the BB cones fit on the spindle? That would deterrmine if it's faulty/wrong bearings or just a wrong BB/Spindle all together.

& have you tried putting a different 19mm crank spindle(other than Mongoose) in either the Spanish BB or the Mongoose one, to compare spindle size? Profile used to make 20mm cranks, I suppose it's possible that Mongoose is doing something similar? Or maybe they're even using American measurements instead of metric?

I've had a couple frames that used them and they've always worked fine. You can buy them on eBay for a decent price too and I'm pretty sure Dan's still sells them. What frame is it?

NateBrown62 wrote:

I've had a couple frames that used them and they've always worked fine. You can buy them on eBay for a decent price too and I'm pretty sure Dan's still sells them. What frame is it?

I actually have no idea. Didnt really care for the price. My son only rides his bike to and from school and occasionally to his friends houses. Just was looking for more modern geometry.

HardBMX_Tim wrote:

Spanish only refers to the outer diameter. The inner diameter stays the same (19mm is still 19mm, 22mm is still 22mm.)

Sounds like defective/wrong bearings to me. What brand are they? I'd try to stick with well known BMX brands, though I know not many offer Spanish any more.

Also, do the BB cones fit on the spindle? That would deterrmine if it's faulty/wrong bearings or just a wrong BB/Spindle all together.

& have you tried putting a different 19mm crank spindle(other than Mongoose) in either the Spanish BB or the Mongoose one, to compare spindle size? Profile used to make 20mm cranks, I suppose it's possible that Mongoose is doing something similar? Or maybe they're even using American measurements instead of metric?

Ya, thats what I figured...

The wierd thing is the cranks fit all the other 19mm bottom bracket bearings I have. Just not these spanish ones...

Im gonna try one more spindle in the spanish bearings and if it doesnt fit I may just scrap the frame and give him one of my frames and grab another used one for cheap.

Actually, now that I think of it...i could probably just re-use the spindle that I have modified and pick up 2 used 8 spline arms...the only reason Im wanting to switch these arms out is because they are wrlded crooked and causing severe tight spots and making the sprocket wear irregularly.

HardBMX_Tim wrote:

Spanish only refers to the outer diameter. The inner diameter stays the same (19mm is still 19mm, 22mm is still 22mm.)

Sounds like defective/wrong bearings to me. What brand are they? I'd try to stick with well known BMX brands, though I know not many offer Spanish any more.

Also, do the BB cones fit on the spindle? That would deterrmine if it's faulty/wrong bearings or just a wrong BB/Spindle all together.

& have you tried putting a different 19mm crank spindle(other than Mongoose) in either the Spanish BB or the Mongoose one, to compare spindle size? Profile used to make 20mm cranks, I suppose it's possible that Mongoose is doing something similar? Or maybe they're even using American measurements instead of metric?

Bulletpup wrote:

Ya, thats what I figured...

The wierd thing is the cranks fit all the other 19mm bottom bracket bearings I have. Just not these spanish ones...

Im gonna try one more spindle in the spanish bearings and if it doesnt fit I may just scrap the frame and give him one of my frames and grab another used one for cheap.

Actually, now that I think of it...i could probably just re-use the spindle that I have modified and pick up 2 used 8 spline arms...the only reason Im wanting to switch these arms out is because they are wrlded crooked and causing severe tight spots and making the sprocket wear irregularly.

Just buy a new Spanish bb. Flybikes used to use them and so did McNeil

HardBMX_Tim wrote:

Spanish only refers to the outer diameter. The inner diameter stays the same (19mm is still 19mm, 22mm is still 22mm.)

Sounds like defective/wrong bearings to me. What brand are they? I'd try to stick with well known BMX brands, though I know not many offer Spanish any more.

Also, do the BB cones fit on the spindle? That would deterrmine if it's faulty/wrong bearings or just a wrong BB/Spindle all together.

& have you tried putting a different 19mm crank spindle(other than Mongoose) in either the Spanish BB or the Mongoose one, to compare spindle size? Profile used to make 20mm cranks, I suppose it's possible that Mongoose is doing something similar? Or maybe they're even using American measurements instead of metric?

Bulletpup wrote:

Ya, thats what I figured...

The wierd thing is the cranks fit all the other 19mm bottom bracket bearings I have. Just not these spanish ones...

Im gonna try one more spindle in the spanish bearings and if it doesnt fit I may just scrap the frame and give him one of my frames and grab another used one for cheap.

Actually, now that I think of it...i could probably just re-use the spindle that I have modified and pick up 2 used 8 spline arms...the only reason Im wanting to switch these arms out is because they are wrlded crooked and causing severe tight spots and making the sprocket wear irregularly.

NateBrown62 wrote:

Just buy a new Spanish bb. Flybikes used to use them and so did McNeil

I found some new arms for 24.00 shipped on ebay. They are probably not heat treated or anything but as long as they are welded correctly I will be happy.

Thank you all for the input. Its cheaper to just reuse the spindle that works and buy these arms instead of paying like 30 bucks for the bearings.

Bulletpup wrote:

Ya, thats what I figured...

The wierd thing is the cranks fit all the other 19mm bottom bracket bearings I have. Just not these spanish ones...

Im gonna try one more spindle in the spanish bearings and if it doesnt fit I may just scrap the frame and give him one of my frames and grab another used one for cheap.

Actually, now that I think of it...i could probably just re-use the spindle that I have modified and pick up 2 used 8 spline arms...the only reason Im wanting to switch these arms out is because they are wrlded crooked and causing severe tight spots and making the sprocket wear irregularly.

NateBrown62 wrote:

Just buy a new Spanish bb. Flybikes used to use them and so did McNeil

Bulletpup wrote:

I found some new arms for 24.00 shipped on ebay. They are probably not heat treated or anything but as long as they are welded correctly I will be happy.

Thank you all for the input. Its cheaper to just reuse the spindle that works and buy these arms instead of paying like 30 bucks for the bearings.

21 $

Nevermind that's 22mm

Here's one

There were some weird complete bike cranks that I had seen working in a shop that were 20MM. Wasn't super common, usually entry level stuff. That would cause your issue. Take the spindle to a shop and have them put a micrometer on it.

As Dave said. 20mm axles are fairly common on cheaper completes. Gusset make a bb for them iirc

NateBrown62 wrote:

Here's one

Thats just the spacers.

But thank you!

NateBrown62 wrote:

Here's one

Bulletpup wrote:

Thats just the spacers.

But thank you!

Guess I should look into stuff more haha

grumpySteve wrote:

As Dave said. 20mm axles are fairly common on cheaper completes. Gusset make a bb for them iirc

Found my micrometers.

The mongoose spindle measured out to 19.01-19.03mm. On the parts where the bearings would sit and 18.84mm on the splined portions.

Anyone else have a micrometer to see what thier spindle measures?

Im about to take the bottom bracket bearing inner diameter measurements. I will update.

Update:

The damn bearing measures 18.98-19.01mm

There is the problem.

I hope the crank setup i just bought from rubio is in that lower range...