TRADITIONAL Jumpy

[Jude Ephesus]

Here’s the mess!

I’ve got an aftermarket chainring on here, which may be part of the problem. (?)

Maybe I need a spacer between the chainring and the stationary cone?

Definitely a tight/awkward fit between the chainring and BB cup.

If I loosen the cone opposite the drive side, it spins free, but the ‘play’ increases side to side.

Anyone got any input, please let me know:

 

[Wayne]

I looked through the beginning of this post and you stated this "old straight bar frame," is it a Schwinn frame? Being a Schwinn enthusiast I have found Schwinn has used many odd parts, from the tires right though all the parts.

 

[Wildcat]

That chain ring is a good choice, it compliments the frame colors.

Between the chain ring and the cone/nut, there should be a washer. That may be the problem.

 

[Jude Ephesus]

I looked through the beginning of this post and you stated this "old straight bar frame," is it a Schwinn frame? Being a Schwinn enthusiast I have found Schwinn has used many odd parts, from the tires right though all the parts.

Thanks Wayne! I understand the Schwinn dilemma !

It definitely not a Schwinn. It’s a 1933 Rollfast motobike.

I would guess the BB would be universal, but I’m not sure.

-there could be something quirky with the Murray I’m scabbing parts from….

 

[Jude Ephesus]

That chain ring is a good choice, it compliments the frame colors.

Between the chain ring and the cone/nut, there should be a washer. That may be the problem.

View attachment 277685

Awesome: thanks @Wildcat !!!

I was scratching my head a bit….. the Murray didn’t actually have a washer on it!

I think I’m just going to buy an entire assembly as you have pictured so I don’t have to worry about mix and match parts

-I’ve had good luck in t(e past rebuilding bottom brackets from a parts…. This was just a weird deal I guess!

Thanks for the info!

 

[Wildcat]

That's a good idea to get a new set. That washer is a size that isn't common.
Once you ride it a little, adjust the bearings so they're just right and it'll last a long time with little maintenence.

 

[OddJob]

I have run into this as well. Bearings can be slightly differing in size as well as the bearing cone nuts from maker to maker.

 

[twojs.bike]

My guess is the crank is bent. It reminds me of a fork with a bent steerer tube.

 

[Jude Ephesus]

My guess is the crank is bent. It reminds me of a fork with a bent steerer tube.

Maybe! I ordered a complete BB set. I’m going to try that first and see if that works. I’d not, it’s the crank, I guess!

 

[Otto (Spelled Backwards)]

The paint is phenomenal! This is really turning out fantastic...I love it!

 

[ifitsfreeitsforme]

looking forward to seeing this completed. It looks great so far.

 

[Jude Ephesus]

Little by little; had a change of heart on the seat and grips. (Also had a few business trips and a quick battle with the new Covid strain!)