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