I just built a Chaos Machine, so very similar frame. I went 28/9 thinking I didn’t want it to be too hard down low. I’ve never ridden that ratio before. I don’t even think I notice except the speed up top. I might swing towards 30/9 if I were doing it again.
Alvinthf on
Likely you’ll be fixed to a 9t as there’s very few other options, 28 and 30 is usable depending on where you ride. Anything higher becomes a bit of push on anything other than flat though.
FloridaCelticFC on
30 x 9
Specialized6 on
I’d go 30/10!
Adventurous-Ad-9778 on
25-9
The_Broken_Shutter on
It’s really all preference and what clears the chain stay
2wheelzrollin on
28/9 or 30/10
brianbmx94 on
30/9 is the way brother. It’s what’s on my BTMXL
Honk-Tuah on
Totally depends on your style and environment of riding. I run 28/9 only because i ride to and from spots. If that wasn’t a factor i’d be on 25/9 for the acceleration at spots with not much run up
flabby_american on
I’m 25/9 on the BTM XL. Love it.
If I had to ride spot to spot.. maybe higher. But for showing up and getting to it 25/9 is sweet.
zombie_pr0cess on
44/16
jaeward on
Would love to build up a maddog, my favourite frame at the moment. If they had a non disc version I probably would have twisted my arm enough by now.
Livid-Dark4851 on
I like 28/9 but you could probably find a 29 that won’t cause any hassle dropping in
14 Comments
28 or 30 x 9
Sweet.
I just built a Chaos Machine, so very similar frame. I went 28/9 thinking I didn’t want it to be too hard down low. I’ve never ridden that ratio before. I don’t even think I notice except the speed up top. I might swing towards 30/9 if I were doing it again.
Likely you’ll be fixed to a 9t as there’s very few other options, 28 and 30 is usable depending on where you ride. Anything higher becomes a bit of push on anything other than flat though.
30 x 9
I’d go 30/10!
25-9
It’s really all preference and what clears the chain stay
28/9 or 30/10
30/9 is the way brother. It’s what’s on my BTMXL
Totally depends on your style and environment of riding. I run 28/9 only because i ride to and from spots. If that wasn’t a factor i’d be on 25/9 for the acceleration at spots with not much run up
I’m 25/9 on the BTM XL. Love it.
If I had to ride spot to spot.. maybe higher. But for showing up and getting to it 25/9 is sweet.
44/16
Would love to build up a maddog, my favourite frame at the moment. If they had a non disc version I probably would have twisted my arm enough by now.
I like 28/9 but you could probably find a 29 that won’t cause any hassle dropping in