SUNDAY. Tweaking my Dahon bicycle.
Actions:
1) Lubricate seat post
2) Replace platform pedals with Shimano SPD clips
3) Rotate brake levers 20-degrees around the handlebars
4) Rotate shifter-grip 20-degrees around handlebars to permit #3.
5) Tighten bolt that links handlebars/headset/fork.
6) Test ride bike with my powerful new pedals
Observations
1) Clicking/popping noises coming out of the transmission when I pedal hard in low gears
2) Rear brake mal-adjusted and rubbing the wheel
3) One rear drop-out has severe scraping marks from the bolt of the axle.
Attempted Solution
1) Turn the adjusment knob on the shifter to make sure the two yellow lines are aligned on the hub, which should mean the hub is in correct tuning, alignment.
Results
1) Continue failure, problem.
My next ideas?
1) Hub is broken internally?
2) Twist shifter is somehow internally broken so the indexer doesn’t operate
3) Cable path is screwed up and somehow shifting or unshifting the bike
Narrative…
So I fixated on #1 being the issue after I confirmed #3 was ok, and that the only adjustment on #2 was my loosening/retightening the handlebar clamp. I even posted notes on some forums about the problem. Nothing answered me exactly. And I got some things like, “is the chain clean?” “is the chain loose?” etc.
Anyway, I was disgusted so threw the bike in my trunk so that I could take it to the store after work. While at work I was thinking, “even if the chain is loose (it was a bit floppy), there is no way there is enough slack for the chain to slip puling around the cogs.”
After work, set off to the store (in the west part of singapore, where I always get lost). Halfway there I start wondering if maybe the chain driveline is not straight. That’s the first thing I said to the guy when I arrived at the store.
Then as he’s looking at it, the whole answer falls on top of me like that scene at the end of The Usual Suspects when suddenly (and too late) everything is apparent:
I put on SPD pedal clips, which allows me to pedal with substantially more power. This pulled the axle so hard that it slipped in the dropouts, scraping them and also pulling the wheel tight against one brake pad. The noise was the chain coming off the final tooth of the cog, not from internal to the hub. (which I should have known — it was a chain-noise similar to what I’d hear from a derailler).
If I had thought about this properly, for two minutes, I should have realized this, and could have fixed it in ten minutes, instead of embarassing myself by having to take it to a bike shop. Ugh. Cursed myself all night for this. All the clues were there, noticed, and totally ignored.