Help! What is the blue button???

[Leannelle]

Thanks for all the advice - much appreciated

 

[jimriley]

Thanks for all the advice - much appreciated

I found this useful, my gears were out of flunter, not changing properly. Watched on phone as I worked in the bike.

 

[Leannelle]

I found this useful, my gears were out of flunter, not changing properly. Watched on phone as I worked in the bike.

That’s a really useful video - thanks!

 

[jimriley]

That’s a really useful video - thanks!

Park tools do a range of them. V useful.