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Run your seat post too far out and you risk having this happen.
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Pedal too hard and you risk having this happen.
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Change gears too hard and you risk having this happen.
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Bounce your suspension too hard and you risk having this happen.
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Bloody hell... it sounds like you can't actually do much on a bike without destroying your seat tube! Well... it's not really that bad and we've repaired so many breaks and cracks in this area of a frame that we really doubt there's much that can beat us. Feel free to surprise us if you think you can.
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Some frame designs are very good at breaking at the top of the seat tube. We can repair the damage and "wrap" the area making it stronger than it was when it came from the factory.
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When a seat tube parts company with its stays, a repair is only a phone call away regardless of whether it's a welded or lugged frame, in Aluminium, Steel, CrMo or Titanium.
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Another example of a repair at the top of a seat tube. As we keep saying to people... no two repairs are ever the same.
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Depending on the frame design, breaks like this can usually be repaired "invisibly". This hardtail banged down hard on the front derailleur and snapped the seat tube like a twig.
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Another "invisible" repair (it's all done inside the frame), this time on a full suspension bike.
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Cracks and breaks at the very bottom of a seat tube often require some gusseting like this to strengthen and stiffen the whole area. Yes we COULD simply weld up your frame and make it look pretty... in fact anyone could... but we wont, because it isn't safe and it wont last.
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Seat "masts" can break too. This GT cracked in three places (see the red lines). We worked out exactly what was needed in the way of "side" gussets and the end result is here for you to see.
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An example of the type of gusset we may decide to use.
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A similar gusset to the one above, but in a fairly unusual position. The way we do a repair is always decided on once we actually see the problem. It all depends on your frame design, material, the exact size and location of the crack/break and our assessment of "why" it broke in the first place.