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

Go Back   > >

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.

User Tag List

Thread Tools Search this Thread
Old 06-13-08, 05:17 AM   #1
Thread Starter
Join Date: Jun 2008
Location: Columbus, MS
Bikes: Suteki
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
shimano cranksets

I have an old Suteki beater bike with a shimano 170 crank set. I was interested in possibly lowering the gearing a bit, currently has 52 and 42 rings. also interesting in having a 3 ring crank and 175 pedal arms. Are all shimano's cranks compatible or are there groups of compatibility? Did not know if it is doable and what to look for if it is. bike also has Shimano 600 derailleurs, if that is needed for info.

newbiedog is offline   Reply With Quote
Old 06-13-08, 05:30 AM   #2
Senior Member
Join Date: Mar 2007
Location: Louisville, KY
Bikes: Trek Madone 5.5, Klein Q Pro Elite, Surley LHT
Posts: 469
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You can change to a triple. You will need to change the BB to accept the added length of the extra chain ring. Also will need to change the front and rear dérailleurs.
kycycler is offline   Reply With Quote
Old 06-13-08, 05:34 AM   #3
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 30,244
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 642 Post(s)
Shimano has made many different crank designs over the years but they are typically interchangable within groups of the same period.

Your current crank is probably a square taper bottom bracket design and you may be able to fit smaller rings. How small will depend on the "bolt circle diameter" of the chairring bolts (130 mm or 110 mm). A 130 mm bcd will accept an inner ring down to 38T and a 110 mm bcd will take down to 34T.

A new triple crank could be fitted and will most likely require a new bottom bracket so the two will have to be compatible for design and length. For really low gearing you could even use an MTB crank which are usually geared 44/34/22.

The current derailleurs may be usable but it will depend on the crank and gearing you choose. Your rear derailleur has a better chance of being usable.
HillRider 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 02:03 PM.

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.