Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Raleigh MTi 1000 seatpost size?

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.

Raleigh MTi 1000 seatpost size?

Reply

Old 10-25-12, 09:30 AM
  #1  
Reynolds 
Passista
Thread Starter
 
Reynolds's Avatar
 
Join Date: Jul 2005
Posts: 6,449

Bikes: 1998 Pinarello Asolo, 1992 KHS Montaña pro, 1980 Raleigh DL-1, IGH Hybrid, IGH Utility

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 400 Post(s)
Raleigh MTi 1000 seatpost size?

A friend got this old Raleigh Ti frame w/o seatpost. It has a shim for an around 30mm seatpost, but the slot is narrower at the top, as if the seattube was squeezed, and there's a bulge at the lowest part of the slot. Without the shim, a 31.6 seatpost goes in, but then jams. Anyone knows what the exact original saetpost size was?
Reynolds is offline  
Reply With Quote
Old 10-25-12, 09:38 AM
  #2  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,049

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 120 Post(s)
Tagged: 1 Thread(s)
Quoted: 4324 Post(s)
The bulge is either normal weld distortion, which is why they used a shim originally, or is because of a slight bend which is why the 31.6 no longer fits.

You might go to the Raleigh site, or phone them to confirm the original spec. Otherwise, you can measure the wall thickness of the shim, double that and subtract from 31.6 to get the ID (if you're 100% sure that 31.6 is the right starting place. Or you can carefully close the shim until the slot is the same width as the bottom of the slot in the frame, and measure the ID at the bottom, so it isn't affected by the distortion at the top.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Reply With Quote
Old 10-26-12, 08:24 AM
  #3  
Reynolds 
Passista
Thread Starter
 
Reynolds's Avatar
 
Join Date: Jul 2005
Posts: 6,449

Bikes: 1998 Pinarello Asolo, 1992 KHS Montaña pro, 1980 Raleigh DL-1, IGH Hybrid, IGH Utility

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 400 Post(s)
Thanks FB. Looks like the shim was glued in place by the factory and there's some residue left. I think that polishing the seattube a 31.6 should fit. The top of the tube seems to have been slightly 'bottlenecked' (like a rifle cartridge).
Reynolds is offline  
Reply With Quote

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