Q559 and BOB trailer compatible??

kdc

Member
Hi all,

I was hoping to use a BOB Yak trailer with my Q559, but it seems the rear dropouts are too narrow for the BOB. Is that right?? I assumed I could use the trailer but maybe not? Those who have used one, any mods that could be done?

Thanks in advance for any advice/help.

Kevin
 

benphyr

Guru-me-not
The rear dropout on the Q is 100 mm, standard rear is 135 mm so a difference of 35 mm so if you put a 17 mm spacer on either side outside of the rear seat stays you can then use a standard rear skewer and that should work. You could cut it from an appropriate diameter pipe or add washers to test. I don’t have a Bob so YMMV.
 
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benphyr

Guru-me-not
The Bob Yak is made out of steel so it should be able to be squeezed inwards to the axle attachments and it should be no big problem. It appears as though the special skewer may only be able to be cut down to 126 mm though so you would need some spacers if that is the case. Someone correct me if I’m wrong.
 
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kdc

Member
Thanks guys, this really helps.

Looking at the website, it looks like the minimum for the BOB skewer is 140mm. I suppose I could bend the trailer fork, but is there any reason I shouldn't use 20mm spacers on each side? And what would you recommend to use? Would a bike store have something like that, or more like Home Depot??

TIA!
 

super slim

Zen MBB Master
Thanks guys, this really helps.

Looking at the website, it looks like the minimum for the BOB skewer is 140mm. I suppose I could bend the trailer fork, but is there any reason I shouldn't use 20mm spacers on each side? And what would you recommend to use? Would a bike store have something like that, or more like Home Depot??

TIA!
Home Depot 1/2" sch 40 steel pipe 12 mm id 20 mm OD
 
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super slim

Zen MBB Master
1/2" standard Weight, is the same as Sch 40, in small pipe sizes.
Sch 40 sets the steel wall thickness!
 

benphyr

Guru-me-not
In North America (not sure about rest of world) this is a very rough explanation:
1/2" NPS (Nominal Pipe Size) - is the approximate pipe size - 1/2" might not be 1/2 inch in any actual dimension depending on material.
Sch 40 is short for Schedule 40 - A chart in the standards that sets the wall thickness according to standards. Sch 40 (pronounced sked 40) is the most common for many applications.

@super slim gave the specifics for Sch 40 steel pipe above in post #5 - basically you need something that will fit the quick release inside it and transfer the pressure from the nut/quick release nut to the frame.

The Bob Yak Trailer from their website: http://www.bobgear.com/bike-trailers/yak

upload_2019-6-12_7-3-30.png


Close up view of attachment point:

upload_2019-6-12_7-3-48.png


Standard Skewer:

upload_2019-6-12_7-4-21.png


(140mm skewer) can be trimmed down to at least 126.5mm:

upload_2019-6-12_6-54-35.png
 

benphyr

Guru-me-not
1/2" = 1/2 inch in NPS (Nominal Pipe Size) which means approximate pipe diameter depending on material.
Sch 40 = Schedule 40, a chart giving the agreed upon dimensions from a Standard.

Not sure if that applies the same all over the world.
 

kdc

Member
Thanks @benphyr. That helps a lot. Sounds like if I walk into a Home Depot or similar, give them the sizes @super slim mentions, I'll have what I need.

I could also trim the skewer - I guess I wasn't considering trimming the QR skewer but it does say I can do that. Would you recommend that approach rather than adding spacers? I might still need spacers even at 126.5mm.

It shouldn't be this challenging. But for me, I guess it is!
I appreciate the support and advice!

:emoji_thumbsup:
 

benphyr

Guru-me-not
It will be no problem. From the website information you might need spacers, 8.5-15mm per side. The reason to trim the skewer is only so that it doesn’t stick out of the nut. You wouldn’t have to trim even if you don’t need the spacers.

In case you’ve never done it before, if you do trim, a trick is to put the nut on before you trim. That way you won’t have any trouble getting the nut back on.
 

super slim

Zen MBB Master
The standard 5 mm steel skewers have rolled threads, for increased strength, so don't extend the thread by cutting the thread with a die cutter!
 
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