I’ve found a professional machinist (father of my daughter’s friend) who says he can drill extra pedal holes in cranks for me like:
What lengths do you guys think would be best and/or possible?
In preparation I bought new KH Moments Duals (165/137) (If I had read all the posts I probably would have taken KH Moments Single to not have the second chromoly insert and thus have more space).
My plan was 2 additional holes for the Dual 165/137s:
165/137/117/100 (20/17 : distance between holes)
With 20mm distance from the 137 home, because most threads here say that the KH chromoly inserts are 20mm apart.
But in the German forum, Cyc wrote that he would recommend a minimum of 21mm distance next to the chromoly inserts of the KH duals as he ran into problems trying 20mm (although if I understand right, he was able to do 20mm):
That would mean:
Any opinions/experience? i.e. is 20mm enough? I guess the problem is that if the distance is exactly 20mm and you space it at 20mm and are even 0.02mm too close then it could be a problem.
So should I try?
OK, I know it’s lots of personal preference, but what are some opinions on the lengths?
I’ve been commuting for about 3 times a week for the last 6 months with 127mm for my 16km x2 commute and I have great control and also feel like I could go faster, so I think I could go a little shorter as my standard length for commuting. A few weeks ago I did the commute 2 times with 100mm cranks, and although I was in sum slower as I was not used to the pedals and struggled a bit with mounting, it felt fine and I think with practice it would be ridable.
And for Munic I am presently riding 170mm (I found 150mm was too short, although that was months ago and I’m better not), but I think 165mm should not be such a big difference.
- 165 for Muni
- 137 as "bailout" for commuting, when I'm dead, (or for fast XC)
- 116/117 for commuting
- 99/100 for fast commuting and practice
Or should I exchange the duals for KH Moment Singles so I can do something more moderate:
I will see the maschinist this weekend and am hoping to try and set up an appointment beginning of the week.