What are these for?

General cycling advice ( NOT technical ! )
groberts
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What are these for?

Postby groberts » 7 Aug 2011, 5:16pm

Have my front wheel off and noticed two small threaded holes on the inside top of the left fork - what are these for?
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Last edited by groberts on 13 Aug 2011, 4:50pm, edited 1 time in total.

reohn2
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Re: What are these for

Postby reohn2 » 7 Aug 2011, 6:00pm

I'd say dynamo mounts
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groberts
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Re: What are these for

Postby groberts » 7 Aug 2011, 7:06pm

OK so how does that work? That's the brake block in the top right of the photo i.e. the holes are a long way away from the wheel. And, why on the inside?

reohn2
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Re: What are these for

Postby reohn2 » 7 Aug 2011, 7:33pm

groberts wrote:OK so how does that work? That's the brake block in the top right of the photo i.e. the holes are a long way away from the wheel. And, why on the inside?


Think bottle dynamo,with bracket!
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GrahamNR17
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Re: What are these for

Postby GrahamNR17 » 7 Aug 2011, 7:36pm

Defo a dynamo bracket mounting. I have one on my Pa... Pa... can't say it. English bike that's still made here that I don't like very much :oops:

groberts
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Re: What are these for

Postby groberts » 8 Aug 2011, 9:03am

OK thanks, though I still find it strange that the holes are on the inside rather than the outside. I used to have a bottle dynamo (didn't know that was their name) many years ago - it was fantastic until I stopped moving and was thrown into darkness!

reohn2
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Re: What are these for

Postby reohn2 » 8 Aug 2011, 9:12am

groberts wrote:OK thanks, though I still find it strange that the holes are on the inside rather than the outside.


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Graham
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Re: What are these for

Postby Graham » 8 Aug 2011, 2:18pm

This is how Chas Roberts provide for a dynamo bracket . . . . .
DynoBrkt2.jpg
DynoBrkt1.jpg


In this arrangement the bracket only has to be a bit of flat plate. With your arrangement the bracket would have to be a bit more complicated to present a mount point further out from the inside of the fork. . . . Or maybe the dynamo would simply bolt into those holes directly.

fatboy
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Re: What are these for

Postby fatboy » 12 Aug 2011, 9:31am

Definitely dynamo mount however don't expect to be able to get a bracket to fit, my Dawes Horizon has these and Dawes denied all knowledge.

Mind you bottle dymanos work best on the seat stays as your body, bum etc suppress the noise to something acceptable.
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[XAP]Bob
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Re: What are these for

Postby [XAP]Bob » 13 Aug 2011, 7:38am

fatboy wrote:Definitely dynamo mount however don't expect to be able to get a bracket to fit, my Dawes Horizon has these and Dawes denied all knowledge.

Mind you bottle dymanos work best on the seat stays as your body, bum etc suppress the noise to something acceptable.

Harder to reach down and engage though... and harder to check if they're on :p
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LollyKat
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Re: What are these for

Postby LollyKat » 13 Aug 2011, 12:23pm

When I had one I could kick it on with my heel without stopping :) .

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Mick F
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Re: What are these for

Postby Mick F » 13 Aug 2011, 2:52pm

I had a bottom bracket dynamo, and I could engage and disengage without stopping too!
Mick F. Cornwall

E.C.Ryder
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Re: What are these for

Postby E.C.Ryder » 13 Aug 2011, 3:41pm

I`m probably wrong but could they be for Blackburn low riders rack which secures to bosses on the front forks? Though looking at my ones I only have one hole!!

pga
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Re: What are these for?

Postby pga » 13 Aug 2011, 8:08pm

Dynamo mounts - Dawes bikes seem to have these on most forks. They often go unnoticed by the riders.

Whether they suit standard side wall dynamos is another question.

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CREPELLO
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Re: What are these for?

Postby CREPELLO » 13 Aug 2011, 8:27pm

I wish I'd had them on my Dawes bikes. I don't think they're that common. To the OP, I would put blanker bolts in them holes - stop too much watergetting in.

I think they are neat, but a bit out of date, with so many cheap dyno-hubs available now. I'm building LX dyno-hubs (form Rose) into two of my bikes.