Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

Shimano Deerhead and half step question

Notices
Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

Shimano Deerhead and half step question

Old 08-03-15, 12:10 PM
  #1  
mstateglfr 
Sunshine
Thread Starter
 
mstateglfr's Avatar
 
Join Date: Aug 2014
Location: Des Moines, IA
Posts: 10,290

Bikes: '18 class built steel roadbike, '19 Fairlight Secan, '87 Schwinn Prelude, Black Mountain Cycles Monstercross V4, '89 Novara Trionfo, '18 Diamondback Syncr

Mentioned: 92 Post(s)
Tagged: 0 Thread(s)
Quoted: 4009 Post(s)
Liked 977 Times in 629 Posts
Shimano Deerhead and half step question

I am building up an older Diamondback MTB and the donor bike is an 86 Diamondback Apex which came with Deerhead shifting.

The front derailleur has a sticker that clearly says it is made for half step gearing.
The crank has 48-38-28 Biopace rings right now.

I cant test if the derailleur works with the chainring setup as its already taken apart. I see Deerhead FDs on regular triples all the time so it can shift fine with the normal 10tooth drop per ring?
It doesn't have the design of a typical triple FD where the inner plate lower is lower than the outer plate.



With everything, there are no guarantees on older rebuilds. Just trying to figure out if I potentially need to pick up a new FD or start looking for chain rings that make work for half step gearing.
mstateglfr is offline  
Old 08-03-15, 12:20 PM
  #2  
MacGyverBurrito
master of the burrito art
 
MacGyverBurrito's Avatar
 
Join Date: Aug 2014
Location: Orange County
Posts: 187
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It will shift fine.
Ive had 3 if those apex bikes. All with the half step FD and 28-38-48 crankset.
Ive never had an issue
Properly adjust it and you shouldnt have any issues.
MacGyverBurrito is offline  
Old 08-03-15, 02:47 PM
  #3  
nlerner
Senior Member
 
Join Date: Dec 2005
Posts: 12,937
Mentioned: 285 Post(s)
Tagged: 0 Thread(s)
Quoted: 1502 Post(s)
Liked 560 Times in 328 Posts
I've run a half-step plus granny (46-42-28) setup with Shimano Deerhead mechs. It worked great.
nlerner is offline  
Old 08-03-15, 06:12 PM
  #4  
The Golden Boy 
Extraordinary Magnitude
 
The Golden Boy's Avatar
 
Join Date: Aug 2009
Location: Waukesha WI
Posts: 12,035

Bikes: 1978 Trek TX700; 1978/79 Trek 736; 1984 Specialized Stumpjumper Sport; 1984 Schwinn Voyageur SP; 1985 Trek 620; 1985 Trek 720; 1986 Trek 400 Elance; 1987 Schwinn High Sierra; 1990 Miyata 1000LT

Mentioned: 75 Post(s)
Tagged: 0 Thread(s)
Quoted: 1995 Post(s)
Liked 305 Times in 214 Posts
I think it's a matter of a different model, with, I would guess, the bumps inside the cage going higher up to pick up a chain on the 45/48 rather than the 38-42.


Holy Crap- I think I was actually right...

Check the lower oblique views.

Shiimano Deore XT Deerhead Front Derailleur: FD-m700 - Bike Recyclery

Shimano XT Deerhead Front Derailleur: FD-M700, 28.6 - Bike Recyclery



And it also looks like there was an "alpine gearing" version, as well as a version without windows cut out in the plates.
__________________
*Recipient of the 2006 Time Magazine "Person Of The Year" Award*

Commence to jigglin’ huh?!?!

"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.
The Golden Boy is offline  
Old 08-03-15, 06:36 PM
  #5  
smoothness 
Senior Member
 
Join Date: Jul 2009
Location: Hub of the Universe, MA
Posts: 531

Bikes: Centurions, Shoguns, and Stumpjumpers

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 73 Post(s)
Likes: 0
Liked 5 Times in 3 Posts
as long as whatever derailleur you have matches the same curvature on the blade side as a "normal" half-step derailleur, you're fine. you could probably just use anything that's meant to shift a triple down to the minimum chainring that you are using.

addendum:

this is probably not what you want to hear, but from someone who supposedly had the quads to deal with a half-step gearing: it sucked. it might have been because i put it on a mixte with swept back bars, but i never felt like i was in the right gear, and riding uphill was bad. this is when i was young, and still had quads. this was a complete deerhead set up that i lifted from one bike, and put it onto another one. not sure if it was a special version or not; pretty sure it was the "plain" version. ymmv.

Last edited by smoothness; 08-03-15 at 06:41 PM. Reason: clarity
smoothness is offline  
Old 08-03-15, 06:52 PM
  #6  
mstateglfr 
Sunshine
Thread Starter
 
mstateglfr's Avatar
 
Join Date: Aug 2014
Location: Des Moines, IA
Posts: 10,290

Bikes: '18 class built steel roadbike, '19 Fairlight Secan, '87 Schwinn Prelude, Black Mountain Cycles Monstercross V4, '89 Novara Trionfo, '18 Diamondback Syncr

Mentioned: 92 Post(s)
Tagged: 0 Thread(s)
Quoted: 4009 Post(s)
Liked 977 Times in 629 Posts
Originally Posted by MacGyverBurrito View Post
It will shift fine.
Ive had 3 if those apex bikes. All with the half step FD and 28-38-48 crankset.
Ive never had an issue
Properly adjust it and you shouldnt have any issues.
thanks, good to know its worked for others and i can hopefully ignore the tag that says its for halfstep. Id rather have the current 10 tooth change between rings.
mstateglfr is offline  
Old 08-03-15, 06:54 PM
  #7  
mstateglfr 
Sunshine
Thread Starter
 
mstateglfr's Avatar
 
Join Date: Aug 2014
Location: Des Moines, IA
Posts: 10,290

Bikes: '18 class built steel roadbike, '19 Fairlight Secan, '87 Schwinn Prelude, Black Mountain Cycles Monstercross V4, '89 Novara Trionfo, '18 Diamondback Syncr

Mentioned: 92 Post(s)
Tagged: 0 Thread(s)
Quoted: 4009 Post(s)
Liked 977 Times in 629 Posts
I would much rather have 10 tooth gearing vs the half step. easier to choose gears, at least for me.
mstateglfr is offline  
Old 08-03-15, 08:01 PM
  #8  
ramzilla
Senior Member
 
ramzilla's Avatar
 
Join Date: Dec 2014
Location: Fernandina Beach FL
Posts: 3,120

Bikes: Vintage Japanese Bicycles, Tange, Ishiwata, Kuwahara

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Liked 164 Times in 137 Posts
make sure you have a good chain..... I run a KMC 8.99 silver on my half step plus granny setup
ramzilla is offline  
Old 08-04-15, 05:38 PM
  #9  
The Golden Boy 
Extraordinary Magnitude
 
The Golden Boy's Avatar
 
Join Date: Aug 2009
Location: Waukesha WI
Posts: 12,035

Bikes: 1978 Trek TX700; 1978/79 Trek 736; 1984 Specialized Stumpjumper Sport; 1984 Schwinn Voyageur SP; 1985 Trek 620; 1985 Trek 720; 1986 Trek 400 Elance; 1987 Schwinn High Sierra; 1990 Miyata 1000LT

Mentioned: 75 Post(s)
Tagged: 0 Thread(s)
Quoted: 1995 Post(s)
Liked 305 Times in 214 Posts
Originally Posted by smoothness View Post
as long as whatever derailleur you have matches the same curvature on the blade side as a "normal" half-step derailleur, you're fine. you could probably just use anything that's meant to shift a triple down to the minimum chainring that you are using.

addendum:

this is probably not what you want to hear, but from someone who supposedly had the quads to deal with a half-step gearing: it sucked. it might have been because i put it on a mixte with swept back bars, but i never felt like i was in the right gear, and riding uphill was bad. this is when i was young, and still had quads. this was a complete deerhead set up that i lifted from one bike, and put it onto another one. not sure if it was a special version or not; pretty sure it was the "plain" version. ymmv.
The theory is that you shouldn't have to have super strong quads- just shift a lot.

I mostly ride like normal, then use the half step to get into the right gear- so I'm generally not doing the "big up, little up-big down, big up, little up-big down" pattern accelerating.
__________________
*Recipient of the 2006 Time Magazine "Person Of The Year" Award*

Commence to jigglin’ huh?!?!

"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.
The Golden Boy is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bwilli88
Classic & Vintage
24
06-26-17 09:57 PM
engineerbob
Bicycle Mechanics
6
02-04-16 01:45 PM
volantis
Bicycle Mechanics
10
08-11-15 09:18 AM
davidmikesell
Touring
12
07-05-13 07:11 AM
dstke
Bicycle Mechanics
8
12-17-12 04:19 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.