Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Can crankset be shortened on Schwinn 26" Meridian Tricycle?

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Can crankset be shortened on Schwinn 26" Meridian Tricycle?

Old 06-07-17, 03:45 PM
  #1  
free2b12
Newbie
Thread Starter
 
Join Date: Jun 2017
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Can crankset be shortened on Schwinn 26" Meridian Tricycle?

Have limited ROM in knees and thinking this might help.

And if so, where would I find the parts?
free2b12 is offline  
Old 06-07-17, 03:57 PM
  #2  
Rollfast
What happened?
 
Rollfast's Avatar
 
Join Date: Jun 2007
Location: Around here somewhere
Posts: 8,050

Bikes: 3 Rollfasts, 3 Schwinns, a Shelby and a Higgins Flightliner in a pear tree!

Mentioned: 57 Post(s)
Tagged: 1 Thread(s)
Quoted: 1835 Post(s)
Liked 291 Times in 254 Posts
here are some important things to remember.

It isn't the crankset, but the seat post extension you want adjusted.

The most important thing to know is that you are only driving ONE SIDE in most tricycles I've seen. The other is freewheeling.

To maximize power from the stroke you need to have motion best suited to your legs' motion. If that can't work well enough you should consider a motor assist or drivetrain that uses your hands, or a recumbent.
__________________
I don't know nothing, and I memorized it in school and got this here paper I'm proud of to show it.
Rollfast is offline  
Old 06-07-17, 04:03 PM
  #3  
AlexCyclistRoch
The Infractionator
 
AlexCyclistRoch's Avatar
 
Join Date: Mar 2016
Location: Rochester, NY
Posts: 2,202

Bikes: Classic road bikes: 1986 Cannondale, 1978 Trek

Mentioned: 9 Post(s)
Tagged: 1 Thread(s)
Quoted: 875 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
If it has an Ashtabula-type crank, you'll likely need a bottom bracket converter, to change it to a common square spindle, then you can choose cranks in any length.
AlexCyclistRoch is offline  
Old 06-07-17, 04:13 PM
  #4  
thumpism 
Bikes are okay, I guess.
 
thumpism's Avatar
 
Join Date: Jan 2015
Location: Richmond, Virginia
Posts: 8,335

Bikes: Waterford Paramount Touring, Giant CFM-2, Raleigh Sports 3-speeds in M23 & L23, Schwinn Cimarron oddball build, Marin Palisades Trail dropbar conversion, Nishiki Cresta GT

Mentioned: 61 Post(s)
Tagged: 0 Thread(s)
Quoted: 2400 Post(s)
Liked 1,595 Times in 1,108 Posts
One-piece Ashtabula-type cranks used to come in various lengths; 3 1/2", 4 1/2", 5 1/2", and 6 1/2". If it's an old Schwinn the bottom bracket threading is likely 26 TPI whereas non-Schwinn parts would be 24 TPI, complicating things. My suggestion would be to get it to a shop for an up-close look by an old timer, if you can find one.

Barring that, converting to a square taper spindle with the accompanying parts might be easier.

*edit*

Looks like new production, not "real" Schwinn so might be simpler to find something in one-piece.

Hawley distributors sells 165mm (about 6 1/2") and 175mm (about 7"), but for shorter you might need to find a juvie bike to strip at your local co-op. Little bikes generally have shorter crankarms.

https://www.hawleyusa.com/Catalog/Se...cat=5637146731

Last edited by thumpism; 06-07-17 at 04:26 PM.
thumpism is offline  
Old 06-07-17, 04:28 PM
  #5  
maddog34
Senior Member
 
maddog34's Avatar
 
Join Date: Jul 2015
Location: NW Oregon
Posts: 1,374

Bikes: !982 Trek 930R Custom, Diamondback ascent with SERIOUS updates, Fuji Team Pro CF and a '09 Comencal Meta 5.5

Mentioned: 11 Post(s)
Tagged: 1 Thread(s)
Quoted: 552 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
have someone that knows how to adjust your riding position help you SET THE SEAT HEIGHT...

then, ride the bike, and see if you still need a different length crank set

There are many lengths of Ashtabula Crank sets available.... the shorter the crank, the more EFFORT it will take to move the bike, especially when first starting to pedal.....
maddog34 is offline  
Old 06-07-17, 04:30 PM
  #6  
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Posts: 25,483

Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones

Mentioned: 138 Post(s)
Tagged: 1 Thread(s)
Quoted: 5001 Post(s)
Liked 2,585 Times in 1,525 Posts
Originally Posted by thumpism View Post
One-piece Ashtabula-type cranks used to come in various lengths; 3 1/2", 4 1/2", 5 1/2", and 6 1/2". If it's an old Schwinn the bottom bracket threading is likely 26 TPI whereas non-Schwinn parts would be 24 TPI, complicating things. My suggestion would be to get it to a shop for an up-close look by an old timer, if you can find one.

Barring that, converting to a square taper spindle with the accompanying parts might be easier.

*edit*

Looks like new production, not "real" Schwinn so might be simpler to find something in one-piece.
As much as I dislike praising Ashtabula cranks, converting to a different length is easier and cheaper than a cotterless crank. There are also many more choices in crank arm length. If nothing else, there are a vast array of old cranks out there from little kids bikes (120mm, 140mm) to adult bikes (165mm, 170mm, maybe 180mm). Even new ones are dirt cheap at less than $20.
__________________
Stuart Black
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
cyccommute is offline  
Old 06-07-17, 05:43 PM
  #7  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 13,185

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 1519 Post(s)
Liked 806 Times in 589 Posts
Having "bad" knees helps me realize your plight. Going from 170 to 165mm cranks made a world of difference. Like NO knee pain from some knee pain. (175mm was chronic knee pain)
A semi close pic of both sides of the crank would be useful to determine exactly what you have.
Bill Kapaun is offline  
Old 06-07-17, 05:54 PM
  #8  
McBTC
Senior Member
 
McBTC's Avatar
 
Join Date: May 2015
Posts: 3,847

Bikes: 2015 22 Speed

Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 1531 Post(s)
Liked 36 Times in 30 Posts
How low do you believe you need to go and what do you have now? Ride2 Crank Arm Shorteners (available through Amazon) have 4 discreet lower settings so how low you can go will depend initially on what you have now. If you only need to go as low as 165, a new set of Shimano cranks isn't expensive if you plan to get years of use out of it but going lower than that is expensive as it involves buying equipment in the specialty market that whose customers come primarily from Triathletes who are looking for a competitive edge and are willing to spend the bucks to gain an edge on the competition.
McBTC is offline  
Old 06-07-17, 06:24 PM
  #9  
thumpism 
Bikes are okay, I guess.
 
thumpism's Avatar
 
Join Date: Jan 2015
Location: Richmond, Virginia
Posts: 8,335

Bikes: Waterford Paramount Touring, Giant CFM-2, Raleigh Sports 3-speeds in M23 & L23, Schwinn Cimarron oddball build, Marin Palisades Trail dropbar conversion, Nishiki Cresta GT

Mentioned: 61 Post(s)
Tagged: 0 Thread(s)
Quoted: 2400 Post(s)
Liked 1,595 Times in 1,108 Posts
Originally Posted by maddog34 View Post
have someone that knows how to adjust your riding position help you SET THE SEAT HEIGHT...

then, ride the bike, and see if you still need a different length crank set

There are many lengths of Ashtabula Crank sets available.... the shorter the crank, the more EFFORT it will take to move the bike, especially when first starting to pedal.....
Let's not drag common sense and practicality into this. If the man wants shorter cranks, let's give him shorter cranks!

I suspect if knee range of motion (ROM) is the issue then the original idea might be best. Has the OP consulted a physical therapist to evaluate the limitation?

Last edited by thumpism; 06-07-17 at 06:28 PM.
thumpism is offline  
Old 06-07-17, 06:58 PM
  #10  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 13,185

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 1519 Post(s)
Liked 806 Times in 589 Posts
Originally Posted by thumpism View Post
Let's not drag common sense and practicality into this. If the man wants shorter cranks, let's give him shorter cranks!

I suspect if knee range of motion (ROM) is the issue then the original idea might be best. Has the OP consulted a physical therapist to evaluate the limitation?
IF your knees don't bend as far as they used to or one as much as the other, you don't need a doctor to tell you. Your knee(s) will.
Bill Kapaun is offline  
Old 06-07-17, 09:49 PM
  #11  
nfmisso
Nigel
 
nfmisso's Avatar
 
Join Date: Mar 2011
Location: San Jose, CA
Posts: 2,991

Bikes: 1980s and 1990s steel: CyclePro, Nishiki, Schwinn, SR, Trek........

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 384 Post(s)
Likes: 0
Liked 5 Times in 5 Posts
Originally Posted by Bill Kapaun View Post
IF your knees don't bend as far as they used to or one as much as the other, you don't need a doctor to tell you. Your knee(s) will.
++++++


Now to the OP's question:
cranks: https://www.amazon.com/Sunlite-Piece.../dp/B000WY5QTY pick the length you want.

worst case, you may need this as well: https://www.amazon.com/Sunlite-Botto.../dp/B000AO9PBQ 24TPI to go with the cranksets above, 65mm or 68mm is the shell width of the BB housing on your trike. Scroll down to #2 on this page which shows how to measure: https://www.nashbar.com/webapp/wcs/s...bikeSpot_Part1
nfmisso is offline  
Old 06-07-17, 10:01 PM
  #12  
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Posts: 9,608
Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
Quoted: 705 Post(s)
Liked 397 Times in 251 Posts
Uh, people... the Schwinn 26" Meridian Tricycle has three-piece cranks. Judging by the photos, they appear to be mounted on a square-taper bottom bracket.

Free2B... any decent bike shop should be able to help. Swapping crankarms is a straightforward job, but it requires some special tools.

Short crankarm pairs are available:
https://www.niagaracycle.com/categor...-arm-set-145mm
https://www.niagaracycle.com/categor...et-155mm-130mm
https://www.niagaracycle.com/categor...-arm-set-165mm
but you will also need a chainring to match.
__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills is offline  
Old 06-08-17, 07:51 AM
  #13  
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Posts: 25,483

Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones

Mentioned: 138 Post(s)
Tagged: 1 Thread(s)
Quoted: 5001 Post(s)
Liked 2,585 Times in 1,525 Posts
Originally Posted by Jeff Wills View Post
Uh, people... the Schwinn 26" Meridian Tricycle has three-piece cranks. Judging by the photos, they appear to be mounted on a square-taper bottom bracket.
I'm not sure if that is always true. Before I posted, I checked and the bike I saw had Ashtabula cranks. Now I'm seeing ones with 3 pieces cranks. It may depend on the model year.
__________________
Stuart Black
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
cyccommute is offline  
Old 06-09-17, 03:05 AM
  #14  
okane
Senior Member
 
okane's Avatar
 
Join Date: May 2009
Posts: 1,039
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Liked 5 Times in 5 Posts
Perhaps I just don't get it, but I have bad knee/back problems and can't ride without knee pain anything smaller than a 23" frame. This allows me to get almost full leg extension on the power stroke and limits how far I need to bend the knee on the upstroke.

What I am suggesting is that my rom is less than on a smaller frame because I don't need to bend the knee as much, i.e., my leg stays straighter throughout the cycle whereas with a smaller frame or crank arm I would start out with the knee already bent on the bottom of the power stroke and bend it even more on the top of the upstroke.

Someone previously mentioned seat height as a possible solution which makes sense to me (but I still need the larger frame as I am six feet tall and top tube length is too short on smaller frames).

For me, more knee bend is problematic. However none of the above applies if the knee condition is such that the person has a bent knee and cannot straighten the leg.
okane is offline  
Old 06-09-17, 02:23 PM
  #15  
nfmisso
Nigel
 
nfmisso's Avatar
 
Join Date: Mar 2011
Location: San Jose, CA
Posts: 2,991

Bikes: 1980s and 1990s steel: CyclePro, Nishiki, Schwinn, SR, Trek........

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 384 Post(s)
Likes: 0
Liked 5 Times in 5 Posts
Originally Posted by cyccommute View Post
I'm not sure if that is always true. Before I posted, I checked and the bike I saw had Ashtabula cranks. Now I'm seeing ones with 3 pieces cranks. It may depend on the model year.
Ditto; must very by year.......so OP need pictures.
nfmisso is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
666pack
Singlespeed & Fixed Gear
27
10-23-17 07:35 PM
Goad
Bicycle Mechanics
7
06-09-17 11:42 AM
jorglueke
Classic & Vintage
5
10-16-16 06:15 PM
JBanez12
Classic and Vintage Bicycles: Whats it Worth? Appraisals.
2
02-19-12 10:14 PM
burnedthetoast
Classic & Vintage
16
11-08-10 09:38 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 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.