22MM Master Cylinder

[chuck hahn]

So I got the master cylinder I bought on the other wanted parts add I had and bled the system.
It doesn't feel exceptionally hard or "wooden" as some had sounded off about. But it feels better than any GS system I have ever felt
That being said my review is very happily positive. And it has an adjustable handle. Screw the screw in or out to set the lever where you want and tighten the jam nut

[Nessism]

chuck,

A 22mm bore master has 92% more area than a stock dual disc 5/8" bore master. That means that for a given amount of brake force at the caliper, you will have to exert 92% more hand effort, and the lever will travel 92% less. This may not be a perfect explanation, but I believe it's close.

[chuck hahn]

WELL.... its on my bike and ive squeezed it and i can tell you without ANY DEBATE that you are simply wrong.

[rphillips]

Thanks chuck, for me, way more merit in BTDT than in figures on a piece paper. Glad you're getting even closer.

[Nessism]

WELL.... its on my bike and ive squeezed it and i can tell you without ANY DEBATE that you are simply wrong.

Is this a bike that you have ridden? Or just squeezed the lever in the shop? If the latter, how about installing it on one of your roadworthy bikes and then give us a review then?

Edit: since you are clearly not going to believe anything I'm saying, read this...http://www.vintagebrake.com/mastercylinder.htm

I calculated the caliper piston to master cylinder bore area for your bike and it's 7.57.

From Vintage Brake "Ratios lower than 20:1 can result a feel so "wooden" as to have a toggle switch effect: nothing happens until the wheel locks."


2 GS1000 calipers = 2878sq-mm
22mm bore master cylinder = 380sq-mm NOTE: this is so much area, it's not even on this chart!

master ratio.jpg

[roeme]

WELL.... its on my bike and ive squeezed it and i can tell you without ANY DEBATE that you are simply wrong.

We're not trying to tell you it won't work at all, we're trying to tell you will need to work alot harder to brake. That being said, I don't know the stock bore, but I don't imagine it to be 22mm.

Can you test it on the road (please somewhere without much traffic'n'stuff) and report back?

I've recently swapped/repaired a few master cylinders, switched a bike to braided stainless steel hoses, swapped some brake hoses on another bike. I can say that much so far; brake lever feeling in the shop ain't worth jack s..., it's on the ride where it counts. I had spongey brakes which bite as hard as a rabid dog, and I had wooden plank brakes that brake fine initially but you can't get anywhere near a real hard emergency brake...in-built ABS.

"Them figures and those nerds with 'them pesky physics" aren't wrong btw. It just might be that the issue isn't as serious as it could be. There are more factors in play than just bore size. Maybe you're secretly working out.


btw, did you delete the first thread? If so, why?

[chuck hahn]

I deleted it because i bought one. I always delete threads.

[roeme]

Ah, I see...I don't think you should bother to delete, information gets lost that way.

The longer I think about this the more I think this was a typo and the 22mm referred to the handlebar hole. A cursory search (I happen to have bought another bike over the weekend and am thinking about replacing the master cyl. as well) unearths a lot of cheapo offerings that do not mention bore size, but mounting size.

...you wouldn't happen to have a link to the one you've bought?

[LAB3]

Chuck, never try to discount the knowledge of the self appointed GS gurus, it's like questioning the word of the lord himself!

[Nessism]

Chuck, never try to discount the knowledge of the self appointed GS gurus, it's like questioning the word of the lord himself!

The lord helps those, that can't/won't help themselves. And since your post is clearly snark, I have to ask if you bothered to read the link from Vintage Brake? If so, please explain where it's wrong?

[roeme]

Chuck, never try to discount the knowledge of the self appointed GS gurus, it's like questioning the word of the lord himself!

What are you on about? I'm asking for more information in order to understand what's going on here. Because somehow I'd like to bring physics and what chuck is reporting into accordance. I'm not discounting his experience.

Maybe the step-up from 15mm(still not sure if that's stock??) to 22mm bore isn't as problematic as the numbers make it out. Maybe chuck has dual-piston calipers. Maybe he is secretly a wrestler.

But quite certainly you can't cheat physics. Your bike lift relies on the same principle.

So please instead of dropping troll-grade snark please add something useful to the discussion. What do you think is going on here? And if you're like "who cares it works" then kindly stop polluting the discussion, I'm trying to learn something here.

I don't mind humor, but I thought this forum is above belittling people.