Rail 7 Chain ring keeps loosening

[pgtips]

Shouldn't need it. It's a left hand thread.

But it keeps coming undone! Surely a drop of locktite would do the job

 

[GrahamPaul]

But it keeps coming undone! Surely a drop of locktite would do the job

If it keeps coming undone, is it possible that the freewheel hub cone is tightening up and giving you a bit of over-run which reverses the chain tension?

The rear hub on my missus' bike converted itself into a fixie recently which makes me wonder whether this is a possibility. Of course, I might be musing complete and utter bollocks...

 

[protowheeler]

I've been researching this a bit. The BBT-18 comes in octagonal format so you can't use a 36mm socket with it. Instead I will need to buy a 36mm crows foot open spanner to use my torque wrench. The cheapest one of those I can find is 55€. Ouch!

This Unior one uses 1/2" ratchet drive. I'm sure there are other brands that have a similar thing. Trek carries Unior maybe they can order you one if you can't get it from Unior direct.
8 Tooth Cartridge Bottom Bracket Tool - 1671.2/4 | Unior USA

 

[MsO]

Bloody hell a screwdriver and hammer it would be sorted now ??

 

[WilkyWay]

This is what I made, patent pending...

 

[pgtips]

This is what I made, patent pending... View attachment 28203 View attachment 28204

Brilliant mate. Great work buddy, I might have to make me one

 

[Orangie]

You guys must be bored. Look down?

 

[Orangie]

Lock

 

[Doomanic]

Oh yes.

 

[Orangie]

Good use of your time. ?

 

[GrahamPaul]

This Unior one uses 1/2" ratchet drive. I'm sure there are other brands that have a similar thing. Trek carries Unior maybe they can order you one if you can't get it from Unior direct.
8 Tooth Cartridge Bottom Bracket Tool - 1671.2/4 | Unior USA

Thank you! Found it on a Spanish site. Same price in euros as you pay in $. Methinks someone is being a little naughty here given that it's a Slovenian company. I guess we're paying lockdown markup.

 

[moto9]

Use locktite

 

[brizi2003]

Interestingly I saw a review about the Trek Rail, can't remember where, and they complained that the chain ring kept loosening! Also my Kenevo Lockring torque spec is 50Nm - I know its a different bike!

 

[Paul Mac]

WilkyWay I don't believe you made that?
Prove me wrong and make another, then send to me for inspection ?

 

[WilkyWay]

This was the mk2 version. The mk1 was made from thinner wall steel and wasn’t up to the job.
It’s just a steel cylinder with The teeth cut in, welded to a 1/2” socket, then turned on a lathe to smoothen it and buffed.
Happy to take some more pictures for anyone who wants to make one.

 

[kermaperuna]

Hello,

I have the same problem with my Rail 7.

- Do I need to remove the right side crank arm to tighten the chainring lockring

- Does it require any special tools to remove the right side crankarm?

 

[GrahamPaul]

Hello,

I have the same problem with my Rail 7.

- Do I need to remove the right side crank arm to tighten the chainring lockring

- Does it require any special tools to remove the right side crankarm?

Bosch Gen 4 - How to change the chainring?

Park Tool CCP-44 will work, but there are other options too.

www.emtbforums.com

 

[Manicm]

Mine went today proper loose, given it a wash and checked it over, the locking but just keeps spinning, should it be clockwise? Or anti clockwise? Or is it a case of stripping the crank off then securing the nut?

 

[kermaperuna]

Mine went today proper loose, given it a wash and checked it over, the locking but just keeps spinning, should it be clockwise? Or anti clockwise? Or is it a case of stripping the crank off then securing the nut?

Tighten it counter clockwise. You have to take the crankarm off first to tighten the lockring with a proper tool.

Remove the crank nut with 8mm allenkey. Then use crank-puller (ccp-44 is what i used) to remove crankarm. Tighten the chainring lockring counter clockwise with proper tool ( I used BBT-18). After that put the crank arm + crank nut back and tighten with 8mm allenkey.

 

[Manicm]

I definitely need some tools! Thanks!
When tightened once is that enough or does it need constant tightening?

 

[kermaperuna]

I havent had to touch it since and since i tightened it properly I've put +1000km and 70-80% off it is rough trails

 

[MsO]

Locktite hammer and screwdriver worked for me ?

 

[Manicm]

Mines completely come off, can’t of noticed it biking this morning...

 

[Philly G]

Is anyone not bothering with the o-ring? Difficult to torque up the lock ring without the o-ring bunching up, at which point it is surely no longer doing its intended job. Seems to me everything should work just fine without it?

 

[WilkyWay]

There’s definitely no o-ring on mine. It was either never fitted or fell of when it came loose. ??‍

 

[Philly G]

There’s definitely no o-ring on mine. It was either never fitted or fell of when it came loose. ??‍

It cant be that important then, I can't work out what function it's supposed to have. I did read somewhere on here that some mechanics aren't bothering with it either ?

 

[Manicm]

As I don’t have the tools I took the hour drive to the bike shop I got the bike from, all I can say is great service, offered me the software update and sorted the chainring out, shouldn’t come loose again. All sorted all there and then which I wasn’t expecting! Bring on the next ride!