Notices
Alt Bike Culture Chopped, dropped, stretched, lifted, and otherwise cut up and put back together. The art and science of choppers, cruisers, lowriders and the vast world of mutant bicycles.

20" wheels on 26" MTB

Old 08-27-19, 01:09 PM
  #1  
keepontrikin
Junior Member
Thread Starter
 
Join Date: Aug 2019
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
20" wheels on 26" MTB

curious to replace the 26" wheels on my mountain bike with 20" wheels.
anyone done it?

pics?
keepontrikin is offline  
Old 08-27-19, 02:58 PM
  #2  
55murray
Senior Member
 
55murray's Avatar
 
Join Date: Apr 2017
Location: Lafayette, Indiana
Posts: 338

Bikes: 1955 20" Murray modified cruiser, 2015 Trek FX3, 1980 Miyata 610, several other vintage coaster brake machines

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 163 Post(s)
Liked 22 Times in 15 Posts
You first.
55murray is offline  
Old 08-27-19, 07:23 PM
  #3  
kirby999
Senior Member
 
Join Date: Jun 2008
Location: Somewhere South
Posts: 424

Bikes: Schwinn Heavy Duty, Electra Cruiser 1 x2 , Electra 7d Fat Tire, Specialized Roll, Specialized Hardrock , Specialized Rockhopper

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Liked 119 Times in 74 Posts
You’ll need some really short crank arms .
kirby999 is offline  
Likes For kirby999:
Old 08-27-19, 07:43 PM
  #4  
pinholecam
Senior Member
 
Join Date: Jan 2016
Posts: 373
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 132 Post(s)
Liked 10 Times in 9 Posts
Your brakes won't reach unless they are disc brakes.
pinholecam is offline  
Old 08-27-19, 08:21 PM
  #5  
kirby999
Senior Member
 
Join Date: Jun 2008
Location: Somewhere South
Posts: 424

Bikes: Schwinn Heavy Duty, Electra Cruiser 1 x2 , Electra 7d Fat Tire, Specialized Roll, Specialized Hardrock , Specialized Rockhopper

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Liked 119 Times in 74 Posts
Originally Posted by pinholecam View Post
Your brakes won't reach unless they are disc brakes.
Coaster brake rear .
How about a 20” rear and a 26” front wheel. That’ll get your pedals off the ground with some ape hanger bars ?
kirby999 is offline  
Old 08-28-19, 08:37 AM
  #6  
Philphine
Senior Member
 
Join Date: Dec 2007
Posts: 808
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 82 Post(s)
Likes: 0
Liked 9 Times in 9 Posts
i've kinda half thought about it, but i can weld a bit and i'm thinking to get it right some welding will happen. like adding about 3" to the bottom of the frames streering tube to keep the pedal to ground clearance the same, and to switch to a 20" fork so front brakes can still be used (unless disc brakes happen). something would need to happen with the rear triangle too, but i haven't figured that out yet.
Philphine is offline  
Old 08-30-19, 05:09 PM
  #7  
kirby999
Senior Member
 
Join Date: Jun 2008
Location: Somewhere South
Posts: 424

Bikes: Schwinn Heavy Duty, Electra Cruiser 1 x2 , Electra 7d Fat Tire, Specialized Roll, Specialized Hardrock , Specialized Rockhopper

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Liked 119 Times in 74 Posts
Many years ago , when I was in my early teens .
We didn’t have a lot growing up . We’d build bikes from parts others would throw away in their trash . We’d drag them home and piece them together.
Some would saw off the arms of one fork and would hammer wedge them onto the arms of another fork to raise the front of a bike to make a chopper style bike . Usually had a 20” up front and either a 24” or 26” in the rear .
I can remember seeing front wheels and fork arms flying off when some kid would attempt a wheelie ! Haha ! Man , that’s a long time ago .
kirby999 is offline  
Old 09-07-19, 06:19 AM
  #8  
Foxonabike
Junior Member
 
Join Date: Sep 2019
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Liked 11 Times in 8 Posts
some times you just have to do it and see how it turns out
Foxonabike is offline  
Old 09-08-19, 03:55 AM
  #9  
adipe
Senior Member
 
Join Date: Aug 2015
Posts: 86
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 31 Post(s)
Liked 4 Times in 4 Posts
20" to 26" is too large a difference.

not only bottom bracket height is lower but also the too small trail for the front wheel.
Bicycle Trail Calculator | yojimg.net

having the next lower size rims in it can work and some people do it without knowing that possibly the main benefit is in regards to their taste of having an easier to work with front wheel by that trail getting to a lower value. some are using large tire on 24" size rims. having not so wide tires on smaller wheels is not so fun.

the trend is with bigger than 26" wheels. people woke up to the benefits but they still stick to suspension forks for mtb. not too many are able to service their forks as often as recommended.
gravel/CX bikes are more appropriate for regular street riding/commuting. lower than 26" is only useful for kids or people who are really low height.
adipe is offline  
Old 09-09-19, 03:44 PM
  #10  
Foxonabike
Junior Member
 
Join Date: Sep 2019
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Liked 11 Times in 8 Posts
I did build a MTB many years ago with 20" wheels off a BMX, front forks were old ones that got replaced of my 26" wheel MTB so I had to lower the brake mounts, rear triangle was from the BMX with the rear shock unit from the MTB that had been replaced. I built the frame to suit so I could get the bottom bracket up to a good height, also built in a 3 speed hub into the BMX wheel, (not Sturmey Archer, the other one) no pictures of it anymore but it was neat riding it around town, not so good off road because of the smaller wheels, but still good fun.
Foxonabike is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
kokol
Road Cycling
26
09-28-17 06:14 PM
uncle uncle
Classic & Vintage
3
12-01-15 11:06 PM
nine9six
Hybrid Bicycles
14
05-10-11 10:21 AM
skogz
Bicycle Mechanics
18
05-09-10 08:46 AM
aldaron
Bicycle Mechanics
8
04-11-10 05:58 AM

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

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