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Old 06-10-09, 02:02 AM   #1
TrekJapan
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Outer Chain guard on Speed P8 fell off

Was riding my Speed P8 for errand work and next thing I know the chain falls off on a normal shift and the plastic outer chain guard fell the heck off the bike. Every one of the 5 securing points broke. Visual inspection revealed that two of the screws were missing and a couple more loose.

Check your chainring guards on yer dahons.

Took mine to the shop where I bought it and they said it'd be good to go in a week and they'd go over the whole bike. I'm traveling for a week or so, so that is perfect. Besides, it's not like I don't have other bikes to ride.

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Old 06-10-09, 02:28 AM   #2
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Is this the same Speed P8 where a whole lot of other bolts were loose as well?
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Old 06-10-09, 02:34 AM   #3
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No, that was my Mu P8 I bought at the sporting goods store.

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Old 06-10-09, 06:27 AM   #4
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Ahh, ok, thanks for the heads up. I guess its not a bad idea to check all the bolts every once in a while
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Old 06-10-09, 07:51 AM   #5
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meh, it's not really necessary. all it does is protect your pants.

I haven't had the chain jump in quite a while, in fact, when it did jump off the chainring I couldn't get it to jump back on without lifting it with a stick.
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Old 06-10-09, 10:59 AM   #6
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After it fell off I was 5 or 6 miles from home. I had several chain drops to the outside in that distance. That's why they have that inner guard as well.

John
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Old 06-10-09, 03:05 PM   #7
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meh, it's not really necessary. all it does is protect your pants.
Wrong - chain guard is absolutely necessary to prevent chain drop. Especially as the chain wears. Yours sounds like it doesn't have a derailer - right? In that case no biggie. With derailer - don't leave home without one.
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Old 06-10-09, 06:08 PM   #8
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RD or FD?

with FD there's no need.
with RD only in a 1x# setup, not especially necessary.
folders have a tight chainline, yes, but really not that necessary if you use a flexible 8/9/10sp chain.

just keep the chain within 12-1/16", at the correct length (big big +2links) and it's very unlikely to fall off.
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Old 06-10-09, 06:18 PM   #9
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Originally Posted by AEO View Post
meh, it's not really necessary. all it does is protect your pants.

I haven't had the chain jump in quite a while, in fact, when it did jump off the chainring I couldn't get it to jump back on without lifting it with a stick.
That wasn't like Basil Fawlty hitting his car with a big stick because it wouldn't start?

"RIGHT, I warned you about this, you're going to get what's coming to you!!"

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Old 06-17-09, 02:24 AM   #10
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Was riding my Speed P8 for errand work and next thing I know the chain falls off on a normal shift and the plastic outer chain guard fell the heck off the bike. Every one of the 5 securing points broke. Visual inspection revealed that two of the screws were missing and a couple more loose.
Exactly the same thing happened to me. IMHO it's crazy how flimsy that plastic ring is. And my chain has fallen out a couple of times in 6 km since then.

Looking on the Dahon forum, it's not an uncommon question to ask for replacements, usually with unsatisfactory answers.

My Dahon dealer will be selling me one for AUD$10, which is cool, but I'm afraid it will break again. My other LBSes did not know where to get replacements.

Am I right to assume that the chain guard is required to avoid the chain falling off? Or is it there to protect my pants from chain oil?
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Old 06-17-09, 06:02 AM   #11
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My chain guard broke off my Speed P8 also. Inquired with Thor about replacement, and he may have some coming in soon. No FD but even so my chain dropped within a few miles after riding without the guard. In higher gears the chain deflects to the outside quite a bit. I think the ring is necessary.
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Old 06-17-09, 09:50 AM   #12
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FWIW, my 2004 Speed P8 has alloy inside and outside chain guards. I bought the bike used, but I believe the chain guards are original equipment.
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