A biopace chainring in it self works well for a fixed gear. Even though the chainring is oval, it holds about the same amount of chain whatever the position, and chain tension will vary so very little it doesn't matter in practice. When you throw in the ghostring however, the chain tension will vary quite a bit as the chain opens up and squeezes together by the ovality of the chainring, so it's not a good idea to combine biopace and a ghostring.
Yes, I was afraid in loosing the ghost ring, but it didn't because it was an UG sprocket. I didn't try to skid because the 'fixed' sprocket was just secured by a nut from crank set.
The up and down dancing ghost ring causes a dead gap between forward and backward pedalling --> was impossible for me to do tricks (trackstand).
'Dimension' of ghost ring depends on the clearance of chain. The bigger the safer, but chain stay is the limited factor. I found out with try and error.
That's pretty cool. Do you have a fear of the ghost ring jumping out, especially when skidding hard? Do you notice any increased vibration or wear on cogs or chains?
Hey! Pretty awesome idea how is it when skidding/under pressure up hills? Does the ghost ring have to be a certain size to not get caught in the rear sprocket? Is there an equation to calculate that if so?
And the point is? .....No, I can't think of one either!
harrisonaard1 3 days ago
A biopace chainring in it self works well for a fixed gear. Even though the chainring is oval, it holds about the same amount of chain whatever the position, and chain tension will vary so very little it doesn't matter in practice. When you throw in the ghostring however, the chain tension will vary quite a bit as the chain opens up and squeezes together by the ovality of the chainring, so it's not a good idea to combine biopace and a ghostring.
7Ns 1 month ago
I had a biopace too... until I threw it in the trash
surroscape 2 months ago
Looks dangerous to me
jsvalino 3 months ago
Yes, I was afraid in loosing the ghost ring, but it didn't because it was an UG sprocket. I didn't try to skid because the 'fixed' sprocket was just secured by a nut from crank set.
The up and down dancing ghost ring causes a dead gap between forward and backward pedalling --> was impossible for me to do tricks (trackstand).
'Dimension' of ghost ring depends on the clearance of chain. The bigger the safer, but chain stay is the limited factor. I found out with try and error.
Now it's a SSp
ami8i 3 months ago
This has been flagged as spam show
you could just take a link or 2 out of the chain
uber0kuhl 3 months ago
That's pretty cool. Do you have a fear of the ghost ring jumping out, especially when skidding hard? Do you notice any increased vibration or wear on cogs or chains?
stopglobalswarming 3 months ago
Hey! Pretty awesome idea how is it when skidding/under pressure up hills? Does the ghost ring have to be a certain size to not get caught in the rear sprocket? Is there an equation to calculate that if so?
Nathanielkhall 5 months ago
You have an almost elliptic chainring on your crankset! WTF?
sm58nik 9 months ago
@sm58nik google "biopace". just do it.
georgetothek 8 months ago
@sm58nik
It is elliptic... google "Shimano Biopace" and you'll find some information.
ppeters77 5 months ago
@sm58nik
It is elliptic... google "Shimano Biopace" and you'll find some information.
ppeters77 5 months ago
What a technical victory!
It gives a ghost ring a meaning.
uzisuicid3 1 year ago