Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

Electric Bikes Here's a place to discuss ebikes, from home grown to high-tech.

User Tag List

Thread Tools Search this Thread
Old 05-20-09, 11:47 AM   #1
Thread Starter
Join Date: Apr 2009
Posts: 24
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
27x1.25 Road Bike vs Best Metals

Greetings - I've got a Bridgestone 27x1.25 inch road bike that I bought a decade or so back. Can bike of this wheel size be converted to an electric bike? Seems most everything is 26 inch or less these days.

Secondarily, if I were to buy a new bike (due to not being able to convert my 27-incher) with the intent of converting it to an e-bike, what metals are recommended for the frame? I've read that I need to avoid aluminum since it's too weak to handle the torque, right? Anything other metals? Do bikes with rear wheel motors handle the torque better?
pavers is offline   Reply With Quote
Old 05-20-09, 12:41 PM   #2
JS Tyro
Junior Member
Join Date: May 2009
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If the brake calipers have enough range to adjust the brake pads, you can probably put a 700C wheel instead of a 27". You can easily get hub motors built with 700C wheels.

A visit to a local bike shop can answer this question for you.
JS Tyro is offline   Reply With Quote
Old 05-20-09, 01:27 PM   #3
Senior Member
Join Date: Sep 2005
Posts: 4,758
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
No reason you can't have a hub laced to a 27 inch rim saying you can find the spokes.
Allen is offline   Reply With Quote
Old 05-31-09, 11:02 PM   #4
electronic wizard
raypsi's Avatar
Join Date: Feb 2009
Location: wayne
Bikes: schwinn traveler III
Posts: 20
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
steel vs Aluminum

The bigger the diameter tubing and thicker tubing gives aluminum the advantage over steel. And it's still lighter than steel

With the same size tubing steel wins out.

The bike shop I go to the guy makes the spokes right there on the spot any size. If you want 36 spokes it'll take awhile.

later OM
raypsi is offline   Reply With Quote
Old 06-22-09, 06:29 PM   #5
put our Heads Together
cerewa's Avatar
Join Date: Jun 2003
Location: southeast pennsylvania
Bikes: a mountain bike with a cargo box on the back and aero bars on the front. an old well-worn dahon folding bike
Posts: 3,155
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
If you're not using an unusually high-powered motor then it probably doesn't matter that much what metal your frame is made of; however, if you use a front hub motor you really should only use a bike that has a steel fork (titanium is probably fine too) and no front suspension.

A good way to tell if you have a steel fork is to see if a magnet sticks to it - if it's anything but steel, the magnet won't stick.

I'm told many aluminum-frame bikes have a steel fork.

The reasons folks will suggest you use a steel fork are :

-if an aluminum fork fails, it's likely a piece of it will just pop off instantly. Steel tends to fail by bending so you get a little bit of warning.

-the stress that a hubmotor puts on your bike means that the dropouts are the most likely place to break. So large diameter tubing doesn't really help there. When using parts like dropouts that have approximately the same size dimensions, steel will normally be heaver and stronger.
cerewa is offline   Reply With Quote
Old 06-23-09, 12:07 AM   #6
El Duderino X
El Duderino X's Avatar
Join Date: Jan 2009
Location: Vancouver, Canada
Bikes: 2007 Dahon Cadenza w/ Alfine IGH11, modified MEC Desire w/Alfine IGH8,+ 2 ebikes: Bionx PL350 & 36V eZee FHB/Tidalforce frames.
Posts: 253
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Aluminum frames are fine. As the previous poster mentioned a high torque motor in a front hub app would be better off in steel fork. That being said any average 36v front hub motor (like an eZee) will be fine in an aluminum fork.
El Duderino X is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

All times are GMT -6. The time now is 07:12 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    get answers from real people!
Click to start entering your question.