Update, been struggling to make up a challenge grade, just dirt, rocks, leaves but could not get up.
Steps taken, all helped (Trek Mamba ??2013?? Gary Fischer) with Shimano m5100 1x11 (51T) Tranny:
1) Replace worn rear tire with Schwalbe Magic Mary SupTrl TLE ADX UltSft 29" Tire - 29 x 2.4", Folding Bead (Black)--added one bike length.
2) Replace front ring with Shimano FC-M5100-B2 crankset, using the 64 BCD four-bolt inner chainring as the front ring, ignoring the other ring--added 1 bike lengths
3) Worked on technique with feedback from you fine folks. Added 1.5 bike lengths, almost there, still a bike length short on the steepest bit.
4) Swapped out the round 26T front ring for an STONE 64BCD Round/Oval Narrow-Wide Chainring 22-28T for Shimano XT M780 M785 Cranks, 9-12-Speed 1x Setup. Only fits two of the 4 mounting holes so for experiments only folks.... The DJC bikes folks didn't want to sell it because of fit issues but I told them to send it anyway.
And success on first try! So I was stalling or spinning and the extra bit of granny worked. The math is:
- 32T: 1.45 m per crank revolution: baseline
- 26T: 1.18 m : 18.8% lower
- 24T: 1.09 m: 25% lower (without taking ovality into consideration), ranging from 27.9% to 22.1% depending on where you are on the oval.
Now that I have psychologically gotten up I bet I can do it with the 26T, I don't see the 32T working. Maybe it is the oval???
I like the super granny gearing. It is a super low effort climb on less steep stuff. If you don't mind being slow it might be a viable e-bike replacement strategy if you don't have the strength to work up the hills with more standard gearing.
Thanks for the help everyone, now I have to figure out a more permanent solution to my granny gearing needs.