Retrobike Forum Index

It is currently Thu Apr 02, 2020 7:03 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 7 posts ] 
Author Message
PostPosted: Fri Jul 22, 2016 1:40 pm 
Retro Guru

Joined: Fri Jun 29, 2012 2:32 am
Posts: 290
Location: WV USA
going to polish up and put the original cranks back on my 1988 Specialized hardrock...they are Sugino VP2 and I have most of the old BB for reference ie spindle length see attached pick.

I am guessing I can get a 68 x 124.5 to work for it? , though i have found no shimano in stock anywhere except .au and they wont ship, i did find a yst "no thread" but hesitate to try that as the BB shell threads are still in great shape [currently has a 68 x 113 in it] but am i correct in that the original spindle measurement at 124 is what i am looking for to fit the VP2 crank?

some crazy zhongya brand on ebay from china has the 124.5 length but im not to thrilled with the blue ano cups lol: http://www.ebay.com/itm/MTB-Moutain-Bik ... saYYUbkaJQ


Attachments:
original spindle on 1988 hardrock 124mm (800x600).jpg
original spindle on 1988 hardrock 124mm (800x600).jpg [ 257.11 KiB | Viewed 539 times ]
Top
 Profile  
 
 Post subject: Re:
PostPosted: Fri Jul 22, 2016 2:33 pm 
Old School Grand Master
User avatar

Joined: Sun Mar 14, 2010 2:33 am
Posts: 3744
Location: Kentcestershire
What was the chain line like when that bottom bracket was fitted?

For a mountain bike it should typically be 47.5 to 50mm, so if with the old BB fitted it was on the wide side, you could go a bit shorter, or vice versa: http://www.sheldonbrown.com/bbsize.html

You can also go a mm or two outside the ideal if necessary, for example, if you need to for the pedal end of the crank to miss the chainstay.


Top
 Profile  
 
 Post subject: Re: Re:
PostPosted: Fri Jul 22, 2016 2:59 pm 
Retro Guru

Joined: Fri Jun 29, 2012 2:32 am
Posts: 290
Location: WV USA
xerxes wrote:
What was the chain line like when that bottom bracket was fitted?.

no idea about that really.......

the bike was traded to a buddy way back in 1995 with a bent fork and a broken rear derailleur and the chain was put on one cog.......he stripped it / located a lbs take off 1" steerer fork, painted it and hung it up in his garage, after a while, he stopped biking and I got all of his mtb stuff-park work stand etc, plus the frame and fork, as I had some leftover shimano stx parts from upgrading my first mtb, so I built it up for my dad, and now I have been rummaging through the old stash and found the crankset, thought I would fit it back on,.

yes, sheldons site is a boon, but no real listing for the sugino VP2 and I found another web site that mentions 121 mm for the sugino VP but also no VP2 ........I might try the cheapo Chinese BB and if it turns out to be correct look for a better quality in that size.


Top
 Profile  
 
PostPosted: Fri Jul 22, 2016 3:05 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 9757
Location: New Forest, UK
122.5 is a common size and you won't notice the difference.


Top
 Profile  
 
PostPosted: Fri Jul 22, 2016 3:22 pm 
Retro Guru

Joined: Fri Jun 29, 2012 2:32 am
Posts: 290
Location: WV USA
hamster wrote:
122.5 is a common size and you won't notice the difference.


I was wondering about that, and I believe I have a 122.5 for a Kona project [M730 crankset] that I could fit up to see if it works......

thanks much


Top
 Profile  
 
 Post subject: Re:
PostPosted: Fri Jul 22, 2016 3:44 pm 
Old School Grand Master
User avatar

Joined: Sun Mar 14, 2010 2:33 am
Posts: 3744
Location: Kentcestershire
Can you not quickly re-fit the BB you have? You don't need to worry about greasing the bearings etc., just bung it in, nip it up and fit the drive side crank to take the chain line measurement.


Top
 Profile  
 
 Post subject: Re: Re:
PostPosted: Fri Jul 22, 2016 3:56 pm 
Retro Guru

Joined: Fri Jun 29, 2012 2:32 am
Posts: 290
Location: WV USA
xerxes wrote:
Can you not quickly re-fit the BB you have? You don't need to worry about greasing the bearings etc., just bung it in, nip it up and fit the drive side crank to take the chain line measurement.


one of the bearing sets is missing from the old one


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: 27motorhead, BerthaPog, MSN [Bot], Tc and 16 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group