What your delta temp guide when roasting for bullet? Celsius please hehe

Roasting on the Bullet R1
1

I’m trying o come up with a guide on delta temp : roast level
For IBTS 200g - 600g
+8 is light
+10 is light medium
+12
+14
+16
+18
Etc
For Bean probe 750g - 1000g
+16 medium dark

What’s your rule of thumb for delta temp or guide when profiling?

2

I don’t think you can make it that simple. Roast color is affected by both time and temperature. A delta temp of 10C over 2 minutes is not the same as a delta temp of 10C over 3 minutes. Cheers.
Jim

2 Likes
3

That, and in case of different beans; density, size and water content affects heat conductivity.

4

I can roast the same bean to the same end temperature in different lengths of time and keep the color within a few points of each other. When cupping they taste different but I doubt anyone would be able to tell the difference unless they are side by side.

My rule of thumb is based on end temperature, not degrees from first crack. I like end temperature better because sometimes first crack happens at slightly different times. But I don’t see why this rule wouldn’t work the same way. I might try it. I think it will probably be different for each bean.