Double Dahons

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IaninSheffield

Veteran
Location
Sheffield, UK
After returning from a recent trip I folded my Dahon Speed TR for storage as usual and noticed it wouldn't sit upright; it leaned over. It didn't take long to spot movement in the frame hinge - not the locking mechanism, but the hinge itself. As I rocked the two halves of the frame back and forth to try to better understand what was happening and more importantly how to remedy it, the lateral movement got worse. It would seem the hinge pin must have sheared, but the real problem was I couldn't see a way of extracting it, let alone replacing it. Surely that mean this cracking little folder that has served me so well for 14 years has reached the end of its serviceable days? Despite much keyboard action I only managed to find one reference to disassembly of a Dahon Vitesse hinge - a slightly different arrangement.

Whilst wondering whether replacing the bike might be necessary and casting around on the Bay of 'e', I came across a used Speed TR almost identical to mine at the Buy It Now price of £250. A bit dear for a 10 year old bike, but much less than me buying a new replacement ... and bidding for the listing was available so worth a punt I thought. I won the auction and the bike for £165, which I was happy with, even with the £45 additional cost in fuel to go pick it up.

IMG_2223.jpg

My 'new' steed

Now back at home I've had a better chance to check out my n+1 Speed TR and, apart from the front dynamo light, all seems to be in good working order. The frame is much more scuffed and chipped than my original, the seat post pump foot stay is missing, the front mudguard end cap is missing/broken, the handlebar twist grip has been taped over (repaired), the saddle has a short cut (taped over), the chain guard is missing, and there's no front rack. I'd spotted most of these in the listing photos so no real shocks. On the bright side, this bike has Ergon GR3 bar ends which are longer and gripper than the GR2s on my original bike, and it has the original MKS quick release pedals - as a clipless rider I quickly replaced the pedals on my original bike with SPD pedals and sold on the MKS's ... then later regretted it!



IMG_2235.jpg

Two of a kind?

Now here's the curious thing. I checked the frame hinge and on the 'new' bike it seems there's some sort of retaining grub screw, although whether it releases the hinge pin is yet to be discovered.

IMG_2234.jpg

Original hinge underside - short of drilling it out, can't see how the pin can be released

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Underside of hinge on new bike (not quite in focus - apologies)
I'd be interested to hear any observations/suggestions. I'd also be interested to hear whether anyone thinks my original bike is actually unsafe to ride - when the frame is unfolded and the hinge locked, there's no play in the hinge whatsoever and the frame seems completely locked out. Maybe now I have a replacement bike, I just get the folding bracket on the original welded shut?
 

u_i

Über Member
Location
Michigan
There seem to be some scuffs around the pin in the third photo. Are these just scuffs or is the metal cracked there? From looking around the web the frame is chromoly and that means it can be principally repaired no matter what happened. The question is presumably how much happened and whether given the damage it is worth repairing. If it is indeed just the pin it is not such a big deal.
 
OP
OP
IaninSheffield

IaninSheffield

Veteran
Location
Sheffield, UK
There seem to be some scuffs around the pin in the third photo. Are these just scuffs or is the metal cracked there? From looking around the web the frame is chromoly and that means it can be principally repaired no matter what happened. The question is presumably how much happened and whether given the damage it is worth repairing. If it is indeed just the pin it is not such a big deal.

Thanks and well spotted. I can confirm the scuffs are just surface paint damage rather than anything deeper, and yes, the frame is chromoly - apologies, I should have mentioned that.
You're probably right in that it shouldn't be a big deal, but it is beyond my engineering experience and toolset. It's also not something I'd trust to the LBSs I'm familiar with round these parts ... maybe I need to seek out a frame builder? Or a folding bike specialist?
 

u_i

Über Member
Location
Michigan
It's also not something I'd trust to the LBSs I'm familiar with round these parts ... maybe I need to seek out a frame builder? Or a folding bike specialist?

I would not trust it to a regular LBS either, but an LBS might suggest what resources are available nearby. I would limit carrying the bike around places to limit the possibility of damaging the frame due to the sheared pin. Rather, if necessary, I would use photos in any initial discussions. First, whether through LBS or web, I would try to determine whether there is a Dahon or Tern dealer within any reasonable distance. Next, I would look for other folding bike specialists - not sure whether a place that only carries Bromptons as folding bikes would help. The frame builder would only be of help if there damage to the frame there - a typical frame builder would normally lack understanding of folding bikes. If you found someone, I would first negotiate over email or phone and make an appointment, so that the knowledgeable person would be there when you arrive.

BTW, the last time I used it, the worldwide list of Dahon dealers on the Dahon site was terribly out of date.
 

u_i

Über Member
Location
Michigan
@u_i That's really sound advice thanks. Much appreciated.
Time to start hunting around methinks. I came across C H White & Son, but Malmesbury's a bit of a stretch from Sheffield. Might still be worth contacting them for some advice though.

:okay: I was thinking about them and wanted to check their distance from you, but then had to attend to s-thing else. I ordered from them some Dahon parts and it was a happy experience.

P.S. For one, if there is anybody closer to you who you might turn to with a Dahon, C H White would presumably know.
 
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