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

A pretty familiar story (650b conversion)

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.

A pretty familiar story (650b conversion)

Old 07-02-20, 11:55 AM
  #26  
Andy_K 
Senior Member
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Posts: 12,495

Bikes: Yes

Mentioned: 323 Post(s)
Tagged: 0 Thread(s)
Quoted: 1927 Post(s)
Liked 347 Times in 185 Posts
Originally Posted by abshipp View Post
Must be A23 build week, I finished up a 650b A23 wheelset Tuesday evening
Welcome to the club. We should get T-shirts.

I've got two sets of 650B A23 wheels, one with the standard silver rims and one with polished silver. Trouble is I've only got one 650B bike. Hmm.... What can I do about that?
__________________
My Bikes
Andy_K is offline  
Old 07-02-20, 12:02 PM
  #27  
abshipp 
Senior Member
 
abshipp's Avatar
 
Join Date: Sep 2017
Location: Rockford IL
Posts: 1,939

Bikes: 1976 Motobecane Grand Jubile, 1977 Schwinn Super Le Tour 12.2 Chrome, 1981 Trek 716, 2014 Canfield Nimble 9

Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 1466 Post(s)
Liked 834 Times in 390 Posts
Originally Posted by Andy_K View Post
Welcome to the club. We should get T-shirts.

I've got two sets of 650B A23 wheels, one with the standard silver rims and one with polished silver. Trouble is I've only got one 650B bike. Hmm.... What can I do about that?
Mine are the polished ones

They're replacing a mis-matched set of Synergy/Atlas, so I'm in the same boat!

What to do, having a MTB/touring grade set of 650b wheels....what to do....
abshipp is offline  
Old 07-02-20, 01:38 PM
  #28  
52telecaster
ambulatory senior
 
52telecaster's Avatar
 
Join Date: Dec 2016
Location: Peoria Il
Posts: 3,366

Bikes: Bob Jackson World Tour, Falcon and 98 Bianchi Volpe

Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 1046 Post(s)
Liked 407 Times in 240 Posts
Originally Posted by abshipp View Post
Don't they build up nicely?

This bike looks super fun, kudos!



Must be A23 build week, I finished up a 650b A23 wheelset Tuesday evening
they tension and true so well. I should use good rims more often.
52telecaster is offline  
Likes For 52telecaster:
Old 07-02-20, 01:47 PM
  #29  
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: High Falls, NY, USA
Posts: 38,976

Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem

Mentioned: 472 Post(s)
Tagged: 0 Thread(s)
Quoted: 6412 Post(s)
Liked 956 Times in 628 Posts
You should go way down in pressure. You'll see why.
__________________
Tom Reingold, tom@noglider.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

“When man invented the bicycle he reached the peak of his attainments.” — Elizabeth West, US author

Please email me rather than PM'ing me. Thanks.
noglider is offline  
Likes For noglider:
Old 07-02-20, 02:23 PM
  #30  
canklecat
Me duelen las nalgas
 
canklecat's Avatar
 
Join Date: Aug 2015
Location: Texas
Posts: 11,413

Bikes: Centurion Ironman, Trek 5900, Univega Via Carisma, Globe Carmel

Mentioned: 183 Post(s)
Tagged: 0 Thread(s)
Quoted: 3629 Post(s)
Liked 1,166 Times in 773 Posts
Any problems with crank length from the conversion and lower overall bike height?

A 650B has been on my to-do list for my Univega Via Carisma. Partly to lower the height a bit -- the frame is slightly large for me but generally comfortable after tweaking the fit with a different stem and handlebar. But I'm also hoping the conversion will contribute to a plusher ride.

Much as I like the bike with the current setup -- Nitto albatross bar -- something about it jolts my old neck injury the wrong way on chipseal. And chipseal has increasingly become the standard pavement in my area. I've tried various height/reach tweaks but nothing quite resolves the problem.

Recently I switched my Ironman to latex tubes and was surprised by how much it improved the ride quality. It's more comfortable on bad roads with latex tubes and decent 700x25 tires than my Univega with 700x38 tires at lower pressure.

I'm at the limit of tire width with the 700c setup, but there's plenty of room for fatter tires if I convert to 650B. Even if I could fit fatter 700c tires, it would also raise the overall bike height, which is already marginally tall for me. I think it's a 58cm frame, maybe 60cm, and I'm 5'11" with 33" inseam.

I'll probably need to replace the 175 cranks with 170 to make it work and ensure enough clearance.
canklecat is offline  
Old 07-02-20, 03:44 PM
  #31  
52telecaster
ambulatory senior
 
52telecaster's Avatar
 
Join Date: Dec 2016
Location: Peoria Il
Posts: 3,366

Bikes: Bob Jackson World Tour, Falcon and 98 Bianchi Volpe

Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 1046 Post(s)
Liked 407 Times in 240 Posts
Originally Posted by canklecat View Post
Any problems with crank length from the conversion and lower overall bike height?

A 650B has been on my to-do list for my Univega Via Carisma. Partly to lower the height a bit -- the frame is slightly large for me but generally comfortable after tweaking the fit with a different stem and handlebar. But I'm also hoping the conversion will contribute to a plusher ride.

Much as I like the bike with the current setup -- Nitto albatross bar -- something about it jolts my old neck injury the wrong way on chipseal. And chipseal has increasingly become the standard pavement in my area. I've tried various height/reach tweaks but nothing quite resolves the problem.

Recently I switched my Ironman to latex tubes and was surprised by how much it improved the ride quality. It's more comfortable on bad roads with latex tubes and decent 700x25 tires than my Univega with 700x38 tires at lower pressure.

I'm at the limit of tire width with the 700c setup, but there's plenty of room for fatter tires if I convert to 650B. Even if I could fit fatter 700c tires, it would also raise the overall bike height, which is already marginally tall for me. I think it's a 58cm frame, maybe 60cm, and I'm 5'11" with 33" inseam.

I'll probably need to replace the 175 cranks with 170 to make it work and ensure enough clearance.
I have 3 bikes with 650b conversions. A 175, 172.5 and 170 crank on the respective bikes. I really dont notice pedal strike issues on any of them. The 175 is on a px10.
52telecaster is offline  
Likes For 52telecaster:
Old 07-02-20, 04:08 PM
  #32  
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: High Falls, NY, USA
Posts: 38,976

Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem

Mentioned: 472 Post(s)
Tagged: 0 Thread(s)
Quoted: 6412 Post(s)
Liked 956 Times in 628 Posts
@canklecat, everyone is different, but somehow I can adjust to stuff like that easily. When I'm on a bike at risk of pedal strike, I coast through turns without thinking about it. You might be able to, also.
__________________
Tom Reingold, tom@noglider.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

“When man invented the bicycle he reached the peak of his attainments.” — Elizabeth West, US author

Please email me rather than PM'ing me. Thanks.
noglider is offline  
Likes For noglider:
Old 07-02-20, 04:10 PM
  #33  
natterberry 
Senior Member
 
natterberry's Avatar
 
Join Date: Sep 2017
Location: Springfield, IL
Posts: 530

Bikes: ‘83/‘85 Trek 760, ‘82 Trek 614, ‘77/‘78 Trek 304, ‘74 Raleigh International

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 217 Post(s)
Liked 119 Times in 81 Posts
I’ve only ever hit once, and I was probably doing something stupid.
natterberry is offline  
Old 07-02-20, 04:10 PM
  #34  
ctmullins 
Lurker
Thread Starter
 
Join Date: Nov 2010
Location: South of the North country
Posts: 192

Bikes: Various home-built frankenbikes

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked 34 Times in 21 Posts
For this build, the difference between the old 700x28 and the new 650x42 is a reduction in diameter of at most 3mm. So, negligible in terms of standover height, but transformative in terms of ride quality!
__________________
1987 Nishiki Prestige (now 650B!)
1981 Trek 710
198? Nishiki Olympic 12 mixte


ctmullins is offline  
Likes For ctmullins:
Old 07-02-20, 04:11 PM
  #35  
ctmullins 
Lurker
Thread Starter
 
Join Date: Nov 2010
Location: South of the North country
Posts: 192

Bikes: Various home-built frankenbikes

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked 34 Times in 21 Posts
Originally Posted by noglider View Post
You should go way down in pressure. You'll see why.
Can you quantify “way down” for me?
__________________
1987 Nishiki Prestige (now 650B!)
1981 Trek 710
198? Nishiki Olympic 12 mixte


ctmullins is offline  
Old 07-02-20, 04:36 PM
  #36  
52telecaster
ambulatory senior
 
52telecaster's Avatar
 
Join Date: Dec 2016
Location: Peoria Il
Posts: 3,366

Bikes: Bob Jackson World Tour, Falcon and 98 Bianchi Volpe

Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 1046 Post(s)
Liked 407 Times in 240 Posts
Originally Posted by ctmullins View Post
Can you quantify “way down” for me?
in my exp on 38s about 35 to 40 psi is real nice, but i weigh 200 lbs. I very often start higher.
52telecaster is offline  
Likes For 52telecaster:
Old 07-02-20, 05:52 PM
  #37  
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: High Falls, NY, USA
Posts: 38,976

Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem

Mentioned: 472 Post(s)
Tagged: 0 Thread(s)
Quoted: 6412 Post(s)
Liked 956 Times in 628 Posts
I can't quantify. I weigh 165. On 32mm tires, I am in danger of bottoming out on potholes at 30 psi, but I've managed. The more weight you have, the higher pressure you require. The wider tire you have, the less pressure you require.
__________________
Tom Reingold, tom@noglider.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

“When man invented the bicycle he reached the peak of his attainments.” — Elizabeth West, US author

Please email me rather than PM'ing me. Thanks.
noglider is offline  
Likes For noglider:
Old 07-02-20, 07:40 PM
  #38  
seedsbelize 
smelling the roses
 
seedsbelize's Avatar
 
Join Date: Nov 2010
Location: Tixkokob, Yucatán, México
Posts: 13,891

Bikes: 79 Trek 930, 80 Trek 414, 84 Schwinn Letour Luxe (coupled), 92 Schwinn Paramount PDG 5

Mentioned: 102 Post(s)
Tagged: 1 Thread(s)
Quoted: 6232 Post(s)
Liked 527 Times in 361 Posts
Originally Posted by 52telecaster View Post
i very often do that when i lace. It doesnt bother me at all. My son has a23s in 700c on a bianchi. Light and strong!
Same. It's shocking how easy it is to do that. About half of mine come out like that
__________________
Well look what the cat dragged in. Such a fine addition to the thread





seedsbelize is offline  
Likes For seedsbelize:
Old 07-02-20, 07:48 PM
  #39  
seedsbelize 
smelling the roses
 
seedsbelize's Avatar
 
Join Date: Nov 2010
Location: Tixkokob, Yucatán, México
Posts: 13,891

Bikes: 79 Trek 930, 80 Trek 414, 84 Schwinn Letour Luxe (coupled), 92 Schwinn Paramount PDG 5

Mentioned: 102 Post(s)
Tagged: 1 Thread(s)
Quoted: 6232 Post(s)
Liked 527 Times in 361 Posts
Well I just started thinking about a 650b conversion on my 80 Trek 414.
__________________
Well look what the cat dragged in. Such a fine addition to the thread





seedsbelize is offline  
Likes For seedsbelize:
Old 07-02-20, 07:50 PM
  #40  
Korina
Happy banana slug
 
Korina's Avatar
 
Join Date: Sep 2015
Location: Arcata, California, U.S., North America, Earth, Saggitarius Arm, Milky Way
Posts: 1,841

Bikes: 1992 Specialized Rockhopper Sport, 2016 Giant Liv Rove Lite, 1995 Trek Singletrack 930, 1994 Trek Multitrack 750

Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 670 Post(s)
Liked 322 Times in 226 Posts
Originally Posted by ctmullins View Post
Can you quantify “way down” for me?
Try taking them down to 40 and see how they ride. If you don't bottom out, you can try going down some more until you find the sweet spot.
Korina is offline  
Old 07-02-20, 07:53 PM
  #41  
natterberry 
Senior Member
 
natterberry's Avatar
 
Join Date: Sep 2017
Location: Springfield, IL
Posts: 530

Bikes: ‘83/‘85 Trek 760, ‘82 Trek 614, ‘77/‘78 Trek 304, ‘74 Raleigh International

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 217 Post(s)
Liked 119 Times in 81 Posts
Originally Posted by seedsbelize View Post
Well I just started thinking about a 650b conversion on my 80 Trek 414.
The way should be clear. Proceed
natterberry is offline  
Old 07-02-20, 09:57 PM
  #42  
bwilli88 
Senior Member
 
bwilli88's Avatar
 
Join Date: Jan 2013
Location: Kampong Cham, Cambodia but I have quite a few in Lancaster, PA
Posts: 2,270

Bikes: Bikes in USA; 73 Raleigh Supercourse dingle speed, 74 Raleigh Grand Prix SS, 78 Raleigh Supercourse, 83 Centurion Pro-Tour, 82 Raleigh RRA.

Mentioned: 49 Post(s)
Tagged: 0 Thread(s)
Quoted: 586 Post(s)
Liked 182 Times in 127 Posts
I never saw the bike in person, got it from nlearner and he sent it directly to gugie
As sold to me, nlearner's pic

After a little massaging, the gugieficatizion.

Now if this Covid-19 crap would go away and I could get back to the States I could build it up. Looking at Dura-Ace 7600, I think, with some nice Velocity rims and some Paselas 650bx40.
Gugie built it for Mafac racers. Hopefully it will replace my Centurion Pro-tour here are my #1 bike.
bwilli88 is offline  
Likes For bwilli88:
Old 07-02-20, 10:33 PM
  #43  
52telecaster
ambulatory senior
 
52telecaster's Avatar
 
Join Date: Dec 2016
Location: Peoria Il
Posts: 3,366

Bikes: Bob Jackson World Tour, Falcon and 98 Bianchi Volpe

Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 1046 Post(s)
Liked 407 Times in 240 Posts
Originally Posted by bwilli88 View Post
I never saw the bike in person, got it from nlearner and he sent it directly to gugie
As sold to me, nlearner's pic

After a little massaging, the gugieficatizion.

Now if this Covid-19 crap would go away and I could get back to the States I could build it up. Looking at Dura-Ace 7600, I think, with some nice Velocity rims and some Paselas 650bx40.
Gugie built it for Mafac racers. Hopefully it will replace my Centurion Pro-tour here are my #1 bike.
killer!
52telecaster is offline  
Old 07-05-20, 06:45 PM
  #44  
ctmullins 
Lurker
Thread Starter
 
Join Date: Nov 2010
Location: South of the North country
Posts: 192

Bikes: Various home-built frankenbikes

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked 34 Times in 21 Posts
Bottom bracket is knackered. It’s a Performance-branded cartridge bearing unit I bought about thirty years ago. I suppose I can retire it finally....

I came this close to ordering the ubiquitous Shimano UN55 replacement. Thank goodness I came to my senses and ordered a NOS SunTour cup-and-cone unit for three times the price.
__________________
1987 Nishiki Prestige (now 650B!)
1981 Trek 710
198? Nishiki Olympic 12 mixte


ctmullins is offline  

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.