Chain length and gear sizing beginner
#26
Senior Member

Joined: Aug 2011
Posts: 22,676
Likes: 2,642
From: CID
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
Or you’re doing a conversion on a frame that wasn’t designed specifically for the tires you want to run? maybe it’s a road frame with very short stays designed for the use of very skinny tires, maybe has no dimples on the inside of the stays? Petty common for 70s era road frames, which are very popular choices for conversion. You could easily enough say, use a different frame, but none the less, there are in fact reasons why you could have little room for adjustment and it’s not a ‘frame designed by idiots’. But you’re welcome to your foolish opinion, I guess.
#27
aire díthrub
Joined: Sep 2017
Posts: 553
Likes: 55
From: chatham-savannah
Bikes: Raleigh Competition, Pashley Roadster Sovereign, Mercian Vincitore Speciale
Not something most would be willing to do, and a lot of bike shops won’t do it for liability reasons. I don’t need to do that, nor am I offering such advice to do so. My point was there are in fact legitimate reasons why the full length of a dropout may not be useable. As far as wabi frames is concerned, I have no opinion, because I don’t own one.
#28
Senior Member

Joined: Aug 2017
Posts: 2,773
Likes: 720
From: Central Io-way
Bikes: LeMond Zurich, Giant Talon 29er
...
The other is an ancient road bike with 1970s Campy dropouts. I have it set up to do roughly what I am suggesting for you, but with 3 gear inch possibilities and fast gear changes. 2 minutes at hill tops and bottoms. 3 chainrings. 2 cogs on one side of the hub (21 and 17) and the usual one on the other. Each cog lines up with its respective chainring. The three gears can be 38-21 = 49", 44-17 =70" and 46-14 = 96". (59, 60 and 61 total teeth works out nicely.) (I don't recommend doing this unless you have a machine shop at you disposal and/or engineering/CAD skills and/or most of a grand to burn, but done right it is really fun!)
...
The other is an ancient road bike with 1970s Campy dropouts. I have it set up to do roughly what I am suggesting for you, but with 3 gear inch possibilities and fast gear changes. 2 minutes at hill tops and bottoms. 3 chainrings. 2 cogs on one side of the hub (21 and 17) and the usual one on the other. Each cog lines up with its respective chainring. The three gears can be 38-21 = 49", 44-17 =70" and 46-14 = 96". (59, 60 and 61 total teeth works out nicely.) (I don't recommend doing this unless you have a machine shop at you disposal and/or engineering/CAD skills and/or most of a grand to burn, but done right it is really fun!)
...
#29
Senior Member

Joined: Aug 2011
Posts: 22,676
Likes: 2,642
From: CID
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
Not something most would be willing to do, and a lot of bike shops won’t do it for liability reasons. I don’t need to do that, nor am I offering such advice to do so. My point was there are in fact legitimate reasons why the full length of a dropout may not be useable. As far as wabi frames is concerned, I have no opinion, because I don’t own one.
#30
aire díthrub
Joined: Sep 2017
Posts: 553
Likes: 55
From: chatham-savannah
Bikes: Raleigh Competition, Pashley Roadster Sovereign, Mercian Vincitore Speciale
In this case, not owning one, means I know nothing about it, as I have no interest in knowing anything about wabi beyond what I can glean from others. Therefore it’s probably best to not speak from a point of ignorance. What you choose to do is entirely your decision. No prerequisite required, so I’m not sure how you arrived at that opinion. I just try to avoid talking out of my arse as often as possible. I don’t always manage that, but I at least try.
#31
Senior Member

Joined: Aug 2011
Posts: 22,676
Likes: 2,642
From: CID
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
In this case, not owning one, means I know nothing about it, as I have no interest in knowing anything about wabi beyond what I can glean from others. Therefore it’s probably best to not speak from a point of ignorance. What you choose to do is entirely your decision. No prerequisite required, so I’m not sure how you arrived at that opinion. I just try to avoid talking out of my arse as often as possible. I don’t always manage that, but I at least try.
#32
aire díthrub
Joined: Sep 2017
Posts: 553
Likes: 55
From: chatham-savannah
Bikes: Raleigh Competition, Pashley Roadster Sovereign, Mercian Vincitore Speciale
Thread
Thread Starter
Forum
Replies
Last Post
evilcryalotmore
Singlespeed & Fixed Gear
7
09-30-11 11:01 AM
mjw16
Bicycle Mechanics
11
08-09-11 12:08 PM





