Urgent! Shimano RX100 won't fit on UN54!
08-22-11, 01:00 PM
#1
Senior Member
Thread Starter
Join Date: Jul 2010
Posts: 72
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Urgent! Shimano RX100 won't fit on UN54!
On my friend's Bertoni road bike, I replaced a Stronglight bottom bracket with a Shimano UN54 (70x113), thinking that the Shimano RX100 crankset that I bought would fit.
It doesn't seem to fit properly. Unlike the other bike I put together, the right crank does not go all the way in the BB shaft and the left crank doesn't seem to go in as much either.
None of the bike shops around carry Italian bottom brackets, so I would have to order it. My friend is leaving on Friday, so I would have to order the right one ASAP.
Edit: I double checked and tried to make it work. It seems to work, but ---> see bolded sentence above.
The problem was that the crank did not go in far enough for room to shift to the big chainring.
It doesn't seem to fit properly. Unlike the other bike I put together, the right crank does not go all the way in the BB shaft and the left crank doesn't seem to go in as much either.
None of the bike shops around carry Italian bottom brackets, so I would have to order it. My friend is leaving on Friday, so I would have to order the right one ASAP.
Edit: I double checked and tried to make it work. It seems to work, but ---> see bolded sentence above.
The problem was that the crank did not go in far enough for room to shift to the big chainring.
Last edited by Huge Zits; 08-22-11 at 01:29 PM.
08-22-11, 01:03 PM
#2
Senior Member
Thread Starter
Join Date: Jul 2010
Posts: 72
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Sheldon Brown's Bottom Bracket Size Database
According to Sheldon Brown's Bottom Bracket Size Database, the RX100 crankset's "Length" is "113".
08-22-11, 01:36 PM
#4
Senior Member
Join Date: Nov 2010
Posts: 3,504
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 586 Post(s)
Liked 612 Times
in
447 Posts
113 is the axle length. You need to determine the axle length required for the RX100 cranks. I didn't double-check, but if Sheldon's site says 113, then 113 it is.
As far as shifting the front chainring, it is possible that you have to adjust the front derailer limit screw that controls the outboard movement of the DR.
Apparently it was set for the bb spindle that was on there originally.
As far as shifting the front chainring, it is possible that you have to adjust the front derailer limit screw that controls the outboard movement of the DR.
Apparently it was set for the bb spindle that was on there originally.
08-22-11, 02:26 PM
#5
Cat 6
Join Date: Dec 2007
Location: Mountain Brook, AL
Posts: 7,482
Mentioned: 27 Post(s)
Tagged: 0 Thread(s)
Quoted: 500 Post(s)
Liked 183 Times
in
118 Posts
Just adjust the derailleur. I can't imagine that your chainline is off - if any - a significant amount.
__________________
72 Frejus (for sale), Holdsworth Record (for sale), special CNC & Gitane Interclub / 74 Italvega NR (for sale) / c80 French / 82 Raleigh Intl MkII f&f (for sale)/ 83 Trek 620 (for sale)/ 84 Bruce Gordon Chinook (for sale)/ 85 Ron Cooper / 87 Centurion IM MV (for sale) / 03 Casati Dardo / 08 BF IRO / 09 Dogma FPX / 09 Giant TCX0 / 10 Vassago Fisticuff
72 Frejus (for sale), Holdsworth Record (for sale), special CNC & Gitane Interclub / 74 Italvega NR (for sale) / c80 French / 82 Raleigh Intl MkII f&f (for sale)/ 83 Trek 620 (for sale)/ 84 Bruce Gordon Chinook (for sale)/ 85 Ron Cooper / 87 Centurion IM MV (for sale) / 03 Casati Dardo / 08 BF IRO / 09 Dogma FPX / 09 Giant TCX0 / 10 Vassago Fisticuff
08-22-11, 02:29 PM
#6
Senior Member
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Posts: 12,257
Bikes: Bianchi, Miyata, Dahon, Rossin
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 5 Times
in
5 Posts
the cranks shouldn't bottom out on the axle, if that's what you're talking about.
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
08-22-11, 02:49 PM
#7
Newbie
Join Date: Sep 2004
Location: Ontario Canada
Posts: 56
Bikes: 2002 Surly Instigator, 2008 Specialized Hardrock Sport, 1994 Mongoose IBOC Comp, 1993 Specialized Hardrock Ultra
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 7 Times
in
2 Posts
Which version or RX100 do you have?
RX100 A550 Double 113 Square 43.5 130 7-speed 1990-93
RX100 A551 Double 107 Square 43.5 130 8-speed 1994-2000
RX100 A550 Double 113 Square 43.5 130 7-speed 1990-93
RX100 A551 Double 107 Square 43.5 130 8-speed 1994-2000
08-22-11, 03:01 PM
#8
Senior Member
Thread Starter
Join Date: Jul 2010
Posts: 72
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
113 is the axle length. You need to determine the axle length required for the RX100 cranks. I didn't double-check, but if Sheldon's site says 113, then 113 it is.
As far as shifting the front chainring, it is possible that you have to adjust the front derailer limit screw that controls the outboard movement of the DR.
Apparently it was set for the bb spindle that was on there originally.
As far as shifting the front chainring, it is possible that you have to adjust the front derailer limit screw that controls the outboard movement of the DR.
Apparently it was set for the bb spindle that was on there originally.
Thank you.
I have the 7-speed set.
Thread
Thread Starter
Forum
Replies
Last Post
jgscisum
Bicycle Mechanics
4
10-30-13 08:07 PM
