You still reading my posts?
You must be obsessed.

I apologize for hurting your fee fees.

Every time someone one ups you, you go into a tantrum.

"He didn't take my advice on my perfect suggestion!"
"I knew more than him... once...."
"Look at my bikes! PLEASE someone pay attention to me!!!"

Drill, dremel, file, sharpie to color in the exposed metal and to cover up a filing mistake.
Most RD's don't have enough metal higher up to make a new hole.

Eh, wanted to see if it would work. Well, it did. It wasn't the way I liked.
Came up with a solution, took a while until it mattered.
This bike is a backup, #3 or 4 on the priority.
Had some other mods and overhauls on other bikes that needed to be done first. So I did them.
And build a new computer.... also out of parts lying around.

I can buy a new bike no problem or all the parts I could possibly want. That's boring.
Make something that CAN'T be bought.
Don't compromise you vision.

It's not about the money...
It's about sending a message...

That's right. Anyone can grill a good steak. Cooking something great from lesser cuts, that's craft. The same for a hundred other things.

When I took poli sci in college, the prof was super great, he taught us about the *full* spectrum of political thought, then showed us that (at that time, early 1980s), the democrats and republicans in the USA were (holds his fingers about an inch apart) "that far apart" on the full political spectrum.

The ironic thing is, you and Ron, in terms of philosophy about bikes, are about that same amount apart; You both seek to build up bikes that are bargains in terms of capability versus cost, and unique. Enjoyment in that challenge. Me too.

Ya had me until you went "BOFF SIDES"
Now I can't take you seriously.

By saying I'm wrong, you've proven me correct. And I don't mean about bikes.

• Bele : It is obvious to the most simpleminded that Lokai is of an inferior breed.
  
  Mr. Spock : The obvious visual evidence, Commissioner, is that he is of the same breed as yourself.
  
  Bele : Are you blind, Commander Spock? Well, look at me. Look at me!
  
  Captain James T. Kirk : You are black on one side and white on the other.
  
  Bele : I am black on the right side!
  
  Captain James T. Kirk : I fail to see the significant difference.
  
  Bele : Lokai is white on the right side. All of his people are white on the right side.
  

Update....
I had a similar derailleur collecting dust so I decided to shorten it even shorter to see if I could get more clearance, Clarence.
And now I have 2.5" ground clearance (on gears 3 and 4) or just above the rim.
Now I can have a full flat and no pulley touchie!

I could post pics but it's just like the last one but... ya know.. more.

Might go for another 1/4" with a different idea but at this point it's not needed, it's just to see if I can.

455% gear range... not bad....

Shirley you cannibal be serious.

When someone one-ups me? Whom exactly? You and your asinine, amateurish hacks? Your circuitous, cockamamie solutions to a problem with a simpler, straightforward solution? Oh yeah, you really one-upped me there, champ, a real spanking. You taught me a real lesson. 👏🏼👏🏼👏🏼

Yes I'm serious, and stop calling me Shirley!

Ya know when you've one-up'd someone when they're super triggered and throw a Full Blown Temper Tantrum....
Poor thing just HAS to have the last word.
I like the part where you respond to own lonely thread because no one else will.

.... and who hell says "cockamamie"?

ok "sport"!
You win this round!
Here's your prize!

"Super triggered", "Full Blown Temper Tantrum", yeah...ok, bro. You keep telling yourself that.

I start and update some threads as repositories, for record keeping and for myself, not necessarily for others. I can give a rat's @zz whether people comment. In fact, as most people here can't get a lot of my stuff or turn up their exalted First-World noses at my "Asiatic garbage" gear, or are enamored with, captives of the likes of BF, Brompton, Birdy and Moulton, Dahon, etc., I actually don't expect people to respond. No skin off my back. I do things for myself and for my own pleasure, not for others. Wake up, man.

Who uses the likes of the word "cockamamie"? People with good education, wide ranging diction and a handle of informal Americanisms. Who questions and mocks good diction? People with poor education and limited diction. When a person resorts to questioning diction, you know that person's got nothing in the way of an argument or rebuttal. It's a give-away. That's you.

I'm sure that's what it is....

I always wondered what a Bike Incel would look like.

For reference, this is the ground clearance of a medium-cage RD at its nearest position to the ground with a 20x1.75 (47-406) nominal tire, about 4.5cm.

Less clearance, less gears, less gear range.

Such a sub par solution.

Try to be original...

Sure, bro.

any time now.

Hi everyone! I love all the amazing frames and amazing combos with 50t, 42t and the crazy gear ranges y'all use!

I've got a tandem with 20inch 406 wheels! And trying to get a 10 speed 11-42t cassette! Crazy, right!

I've got an ltwoo groupies a7 rear derailleur 42t!

And I've thought maybe it needs a derailleur extender like the zebra bike had in the thread?

(sorry for no pictures, forums rules say I need a min of 10 posts to upload any xD)

A "wide" 1X cassette, like you are suggesting, 11-42, usually a "standard" rear derailleur for 11-34 will not work without a derailleur extender to drop it down so the top pulley won't hit the larger cogs. However a rear derailleur designed for wide 1X will have the parallel linkage operating at a "steeper" slope, and other tricks like an offset top pulley that drops down as the cage winds forward, so can handle that cassette without an extender. The other factor is RD capacity, so medium or long cage, but without multiple chainrings, often a medium length cage will work, mine does 43 teeth I think.

There are others on here that can make an RD recommendation for wide 1X, if you cannot find in past threads. I hesitate to name a member as they have been scarce for a few months, so I don't want to intrude if there is a reason they are busy elsewhere.

Shimano's all-purpose low/mid-range 1X group parts have had good reviews, darnit if the group name escapes my brain at the moment. EDIT: Shimano CUES with LinkGlide, supposed to be durable for electric bikes, sounds good for a tandem.

Thank you so much Duragrouch !! It's been a loong time, and I really liked your explanation that I'd need a different derailleur or a hangar for a wide 1x cassette.

What I did:

1. Bought 3 different sizes of derailleur extender. ( they were not giving the results I wanted as it was causing the derailleur to hit the tyre). Tried adjusting the b scree, shorter chain. Nothing worked.

2. Was fed up, then just decided to buy the exact derailleur that Ron had. (New Shimano Deore XT M6000 for around 40 USD).

It just worked. No faffing, no playing around. It just worked.

Like how a snake will bite its victim until its venom and victim are finished; I did the same, by troubleshooting and measuring with advice from you and others on this forum.

Glad to help. Yes, Ron was who I had in mind, he's done what you wanted a lot. I had forgotten his posts were on this thread toward the end. He has also mentioned in the past that tire clearance is an issue, not just for the rear derailleur, but with the wide tires he uses, chain clearance between the lowest cog and the chainring can be very close to the tire.

Someone who has their own blog, detailing world touring on a Bike Friday New World Tourist (20"/406 wheels), he had the typical (older) BF setup of 3X crankset and moderately wide cassette (low of 34 or 36 teeth), and discovered the chain rubbing on new wider tires in lowest gears. He either skewed the rear axle in the dropouts, or redished the wheel toward the non-drive-side, to remedy. But that was largely needed due to that 3X crankset, with the smallest chainring well inboard, overlapping the bottom bracket shell. With newer wide 2X cranks, and 1X cranks, there's a bit more clearance for the wide tires.

Can I use m8100 gs derailleur, 11-45t to 20in 406
tia

I'm not familiar with that specific derailleur. Looking up, specs says 12 speed and 35T capacity and 45T max cog. (Surprising to me as my Shimano Tourney GS has capacity of 43T.) So capacity and max are both within capability. I don't know if 12 speed is ok to use on different number of cogs or not.