2x chainring.

[John the Plumber]

Has anyone put a 2x chainring on a 1x boost frame? Thinking or making my hardtail a gravel bike.

 

[JonF]

If its truly a 1x frame, there will be no way to attach the front derailleur. OTOH, If it has a round seat tube of nominal dimension, you can put a clamp on style braze on mount to attach a derailleur.

 

[John the Plumber]

The bike has a round seat tube. The bike is a litespeed Pinhoti and I want to keep it a flat bar.

 

[Glenn Rides After 4 PM CST]

My 2016 pivot. mach 429 trail came 2x.
148 boost rear spacing

Edit... 10 speed 2x. Not 11 or 12

I think it would work

 

[JonF]

The bike has a round seat tube. The bike is a litespeed Pinhoti and I want to keep it a flat bar.

But is it of a nominal dimension that would match typical braze on clamp diameters? Also, it is in the right angle to position it over the cranks? These answers might get you off to a start.

 

[John the Plumber]

My 2016 pivot. mach 429 trail came 2x.
148 boost rear spacing

Edit... 10 speed 2x. Not 11 or 12

I think it would work

Thanks it is a 12 speed but with a little research Shimano makes a 26/36.

 

[John the Plumber]

But is it of a nominal dimension that would match typical braze on clamp diameters? Also, it is in the right angle to position it over the cranks? These answers might get you off to a start.

Thanks, I will have to check it out where it would mount on the seat tube.

 

[Patrick]

Thanks it is a 12 speed but with a little research Shimano makes a 26/36.

Way too low for gravel.

 

[John the Plumber]

Way too low for gravel.

Thanks Patrick. According to Sheldon Brown gear calculator with the 36/10 80 rpm the speed would be 23.7 mph which would be plenty for me. On a road bike my cadance average is 89.......

 

[JonF]

Are you planning on running a road or mtb cassette? The 26t CR on a MTB cassette will be silly low as a 26/51 is damn near a standstill pace. 36t is still within typical 1x configurations it may just be worthwhile to stay 1x and just put in a taller 1x CR like a 40t or whatever max size your bike supports.

 

[John the Plumber]

Cannot fit a 34 let alone a 36. If I could put a 36 with a single I would put it on but the 32 is the biggest ring. It is a mtb cassette I would do a 10/45. I like everybody's input.
Not planning on doing right away but considering it.