Brompton T Line Sleeve Reaming Toolkit

Brompton T Line Sleeve Reaming Toolkit

Please Note: Incorrect use could damage your Brompton frame - if in doubt use your local Brompton dealer 

The seat sleeve on the T line Brompton may need replacing if the seat post is slipping, it could be worn and need replacing 

The kit contains the following: 

• A T line Mandrel 
• A T Line spacing block 
• A T Line Aligner 

Does not include - glue, seat sleeve or a reaming tool 

The following steps will need to be carried out:

1 - Removing the seat sleeve:

• First remove the saddle and pentaclip 
• Unfold the bike
• Undo the seat clamp to allow the seat post to be removed from the bottom of the frame 

2 - Removing the existing sleeve

• Insert the flared end (bottom) of the seat post to the underside of the seat tube until it contacts teh sleeve.
• Gently knock the bottom with a plastic mallet or hammer until the seat sleeve detaches 
• Clean the inside of the seat sleeve to remove any traces of seat sleeve or adhesive 
• Check for any signs of cracks 

3 - Fitting the new seat sleeve

• The replacement seat sleeve should be glued in place using cyanoacrylate glue - this should be applied to the raised surfaces of the seat sleeve 
• Do not use excessive amounts and wear gloves! 
• Carefully insert the seat sleeve into the seat post - wipe away any excess glue using a cloth 
• When aligned correctly yuo should hear a click when the upstanding key aligns with the corresponding hole in the seat tube
• Push the mandrel into the frame and close the seat clamp lever to apply pressure - this ensures an even spread of adhesive
• The mandrel should be left in place for 20 - 30 minutes to allow the glue to set 

4 - Reaming the seat sleeve

• Once the glue has dried, unclamp teh seat post and remove the mandrel 
• Use the spacing block to check that the seat post clamp is tight enough to hold the spacing block in place
• Turn the bike upside down
• It is easier to remove the drive side crank arm - this is not essential 
• The T Line aligner should be inserted into the bottom bracket and sit in the seat tube 
• The reaming tool can now be inserted into the seat tube 
• Using an 8mm Allen/ hex key rotate the reamer clockwise while applying pressure downwards, until the reamer has passed through the end of the seat tube 
• Continue to turn the reamer clockwise while slowly removing it from the seat tube - at no stage should the reamer be turned anti-clockwise!
• Once removed ensure there are no plastic shavings 

5 - Re-fit the seat post 

• Re-fit the seat post
• Ensure it moves smoothly 
• Ensure the seat clamp is adjusted correctly
• Re-fit the saddle and pentaclip

Brompton Q reference: Q103675