How did John Teller actually die?

How did John Teller actually die in Sons of Anarchy? Was it suicide? No matter how many times I watch certain episodes I am unable to figure it out.

• Did Gemma/Clay sabotage the bike and John never knew it and so actually Clay/Gemma killed him before John actually wanted out.
• Did John knew they will sabotage it and was waiting for it as the most logical point to die as a way out? So clay kills the John's mechanic once John dies?

• Was John by then too far gone to make sense of anything and just plainly tries to ride away from the club with his bike and he meets with an accident? (Gemma/Clay is yet to put their plans into action, The mechanic John teller trusts, is still loyal to John, never sabotages the bike and chooses to disappear rather than face Clay? Because if what Jury says is true, and john did not yet want out dead, as soon as he would start a bike he would know, why did he ride out so far. Gemma also says sometime that they put John back together but he is unraveling again. Gemma/Clay mistakenly think they succeeded in killing him.)

  • This is because Jury tells Jax just before he dies S07 EP08 that John wanted out and it's his sacrifice. If Clay/Gemma sabotaged the bike, he would have known it.
  • That also does not make sense of something - If he wanted himself dead, how would that help the club? Clay could go on to make a bigger mess of what he is currently doing now.

If John knew then below may support it:

• Before his death does he believe Clay would see the error of his ways and lead the MC into a better future influenced by his friend's death and Jack's adoption as a son?
• I remember the scene where Clay (possibly) lovingly sees Jack's son in incubator. That would make him his adopted grandfather?
• True to his character, Clay leads the club well for the next few years, sees through many of his decisions and the MC is stable.