Originally Posted by
JohnnyGalaga
For a 26" X 1.9" size, Sheldon Brown shows 2055 but the Sigma manual shows 2089. Then, when you go to actually enter it in the computer, the display has a decimal point which I don't understand.
Should I use 2055 or 2089, and do I need to convert it to something else because of that decimal point on the computer display?
Thanks.
As
sakonnetclip says, Sigma 1606L is the "most confusing computer".
Had similar problem with 700x38c tires -- Sigma manual says nothing about them. When I contacted Sigma, they emailed me the same table that is in their user guide, w/o the data for 700x38c tires. Sheldon Brown's number for the 700x38c tires is 2180. For some reason I put there 2219. So I'm off by 1.7% -- 15 miles (with 221.9 number in my Sigma computer) is actually 14.73 miles according to number in the Sheldon Brown's table. Not a significant difference and I don't want to "play" with the setup to knock out other settings by accident.
Why is that decimal point there? Maybe it's in cm instead of mm.
See the attachment. Seems to me they explain the computer setup in simpler way than their manual.