duncan
Peloton Rider
Posts: 15
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Post by duncan on Oct 25, 2014 16:31:04 GMT
Hi Guys
Has anyone had an issue with changing gear on the front mech on a T300 / T3, or similar?
Changing from small to larger is working OK, but when I click the button to change from largest ring to smaller ring, the selector jumps to the smallest ring - missing out the middle ring.
Before I dismantle the lever assembly, I'd be grateful if anyone has any constructive suggestions.
Cheers
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Post by beatnik69 on Oct 25, 2014 20:06:55 GMT
Adjust the cable tension with the barrel adjuster (the little nubbin on the inside of the left hand shifter). There isn't enough tension in the cable ( I think I've got that right).
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duncan
Peloton Rider
Posts: 15
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Post by duncan on Oct 25, 2014 20:56:49 GMT
Adjust the cable tension with the barrel adjuster (the little nubbin on the inside of the left hand shifter). There isn't enough tension in the cable ( I think I've got that right). I would have said that the cable tension is OK. It will change up the cogs correctly. The problem is when the change switch is pressed - when using the largest ring - this releases the cable tension to move the chain selector to the smaller gear. The problem is, the selector jumps over the middle ring and straight onto the smallest. But thanks anyway.
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Post by jondxxx on Oct 26, 2014 22:40:41 GMT
I would still look at the cable tension. The mechanics of lifting a chain onto a larger ring are different to dropping down to a smaller one when the spring tension is enough to make it over shoot.
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Deleted
Deleted Member
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Post by Deleted on Oct 26, 2014 23:34:17 GMT
With my recent messing about with gear settings at one point i recreated what you are talking about. I think it was cable tension combined with the limit screws compensating for incorrect tension. Undoing cable, resetting limits and re tensioning resolved it (even though i am still tweaking for best setup)
So having experienced this myself i also think its cable tension, but possibly combined with a bit of limit settings.
Although the limits are just stops, you can have an incorrect tension that would put the cage into an incorrect position but the limits are stopping it and thus artificially giving the impression of correct tension, and thus the incorrect manifests elsewhere such as ring skipping.
Id reset and redo and see how that goes.
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Post by jim1966 on Oct 27, 2014 9:19:37 GMT
I experienced this the other week whilst setting up my mates white T3a after he'd had a fall. It jumped from big ring to little missing out the middle.
I released the cable from the front mech and tensioned it in my hand so that I could feel the cable move when I operated the shifter and there seemed to be an extra position on the shifter not used but pushed through if that makes sense?
Anyway, what I did was with the cable in my hand, push the shifter up to the big ring position (it won't go anymore) then click it down two clicks keeping the cable tensioned (there was another click after this which is what I mentioned above) and refit cable to the front mech in the little ring position.
Then adjust the indexing to suit using the barrel adjuster or by moving the cable in the mech. That should sort it. The limit screws can be set without the cable fitted as you can eye them in.
Hope that helps.
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duncan
Peloton Rider
Posts: 15
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Post by duncan on Oct 27, 2014 15:03:56 GMT
Thanks alexjm and jim1966.
I'll revisit the front mech setup again see what happens
Cheers
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duncan
Peloton Rider
Posts: 15
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Post by duncan on Oct 28, 2014 9:35:20 GMT
So, last night I spent about four hours trying to adjust the front mech.
I finally had to concede that playing with the ring selector adjustment wasn't achieving the desired result and resorted to dismantling the handlebar change lever.
Even with only light pressure on the cable, the selector jumps from the outer ring position to the inner ring position.
In fact, it probably jumps past the outer limit and aligns better with a slight push on the lever.
The teeth on the selector mechanism in the handlebar assembly are quite small, in my opinion, and I think the index tooth (if that's the correct term) may have part of the front face missing (i.e. has become damaged); so it won't drop into the gap between the position teeth to select the correct ring when you try to change down.
I guess I will have to contact Decathlon and see what they say, but as I live about 100 miles from my nearest store, it's going to be a pain to return the bike to the store, and then pick it up again. I'll have to see what they say.
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Post by chas on Oct 28, 2014 10:27:56 GMT
I think someone on here had a similar problem a while ago, he sent them the lever to inspect and they then sent a replacement. Means no bike for a while but saves an expensive journey, you may get it sorted quicker going in but speak to them first to make sure they've got a replacement in stock to put on or give you.
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Deleted
Deleted Member
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Post by Deleted on Oct 28, 2014 10:58:45 GMT
Sorry to hear that
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Post by joby on Oct 28, 2014 11:25:58 GMT
So, last night I spent about four hours trying to adjust the front mech. I finally had to concede that playing with the ring selector adjustment wasn't achieving the desired result and resorted to dismantling the handlebar change lever. Even with only light pressure on the cable, the selector jumps from the outer ring position to the inner ring position. In fact, it probably jumps past the outer limit and aligns better with a slight push on the lever. The teeth on the selector mechanism in the handlebar assembly are quite small, in my opinion, and I think the index tooth (if that's the correct term) may have part of the front face missing (i.e. has become damaged); so it won't drop into the gap between the position teeth to select the correct ring when you try to change down. I guess I will have to contact Decathlon and see what they say, but as I live about 100 miles from my nearest store, it's going to be a pain to return the bike to the store, and then pick it up again. I'll have to see what they say. I had the same problem with my rear shifter, I came to the conclusion that the ratchet in the shifter was defective and causing the slippage. Like you, I removed the shifter and reproduced the same problem just by applying light tension to the cable by hand and clicking - it eventually became so bad that one click would result in the the ratchet shifting down all eight positions. Deca will replace if under warranty, although you'll have to post the defective shifter to the store you bought the bike from so they can verify the problem before they send a replacement. If you'd rather not be without for that long you can order (and pay for, obviously) a replacement and they'll send it out. The Microshift shifters aren't off-the-shelf components in Deca so you need to speak to customer services to arrange.
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duncan
Peloton Rider
Posts: 15
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Post by duncan on Nov 14, 2014 15:48:44 GMT
Latest update;
I've been in contact with Decathlon for a couple of weeks.
So far, four email, each with different solution.
I think we are heading for a replacement bike.
Just waiting for confirmation.
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Deleted
Deleted Member
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Post by Deleted on Nov 19, 2014 21:49:44 GMT
I had the same problem with my T3a. Changing up was fine but it skipped the middle ring on changing down.
Decathlon changed the front shifter and mech under warranty. All fine now.
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duncan
Peloton Rider
Posts: 15
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Post by duncan on Nov 21, 2014 21:00:25 GMT
Today, I took the Triban 3 back to Decathlon and was given a Triban 300 in exchange.
Although, I did feel I had to make the point strongly to the staff at the Reading Decathlon, that the replacement had been agreed, and, no, I didn't want to leave it for someone to look at next week - given I live 100 miles from the shop and had needed to take a days holiday to take it to the shop. Not to mention the fuel costs.
Ultimately, I got a new bike, so can't be too unhappy with that. As long as the replacement doesn't develop the same or other new faults.
Spent the afternoon fitting clipless pedals, seat etc.
Unfortunately, it's going to be pouring with rain for the next two days, so the road test will have to wait.
(Yeah, yeah, I know - fair weather cyclist!)
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