RADBMX.CO.UK

Technical & Reference Section => Tech and Restoration => Topic started by: ligbee on April 14, 2008, 08:22 PM

Title: Chainring Problem.
Post by: ligbee on April 14, 2008, 08:22 PM

Bought a couple of chainrings (Sugino/SR style) to which I was going to fit a standard Spider. When I tried to bolt the spider onto either of them, it seems that the spider is too small, is there two sizes of spider or is it a power disk fitting only.

Don't remember this problem back in the day.

ligbee.

Title: Re: Chainring Problem.
Post by: crusty on April 14, 2008, 08:32 PM

how much to small/big?
are you putting all 5 of the bolts in loose before you tighten any up there are a lot more knowledgable people on here that can help but this is all i can think of for now

Title: Re: Chainring Problem.
Post by: ligbee on April 14, 2008, 08:34 PM

You cannot as the pcd of the spider is too small, the radius of the holes could do with being about another 10 mm.

ligbee.

Title: Re: Chainring Problem.
Post by: pickle on April 14, 2008, 08:35 PM

i could be wrong but it sounds like you've got a Sugino spider and Takagi chainring?  the Sugino spiders are smaller, thus there rings are bigger and the oposite for Takagi.

hope that makes sense?

Title: Re: Chainring Problem.
Post by: ligbee on April 14, 2008, 08:37 PM

That sounds about right.

I'll have to find out which one is which as both chainrings and spiders are copies.

Cheers

ligbee

Title: Re: Chainring Problem.
Post by: pickle on April 14, 2008, 08:39 PM

yeah i did exactly the same mate, i had a sugino spider and then bought a Takagi chainring, you need a Sugino chainring mate  :daumenhoch:

Title: Re: Chainring Problem.
Post by: ligbee on April 14, 2008, 08:40 PM

Cheers for that.

Thats why this site rules.


ligbee.

Title: Re: Chainring Problem.
Post by: mark 2 on April 14, 2008, 08:43 PM

Well it sounds as if you got a 130mm bolt circle diameter chainring, something like a takagi, shimano or tioga (same thing) and a Sugino pattern spider which has a bcd of 110mm. You'll need either a Sugino, Suntour or Tuf Neck chainring to fit or get a powderdisc with the dual holes


Here's a 130mm

(http://www.radbmx.co.uk/archive/albums/v213/mikamagic1/martin-bike_1982TiogaUltraDyno_ad-8.jpg)

And these are 110mm

(http://www.radbmx.co.uk/archive/albums/v213/mikamagic1/suginoad.jpg)

Hope that helps :daumenhoch:



***pickle answered while I was typing so it looks like I 've just copied him :LolLolLolLol:

Title: Re: Chainring Problem.
Post by: crusty on April 14, 2008, 08:44 PM

i told you there be some smart people on 'ere

Title: Re: Chainring Problem.
Post by: ligbee on April 14, 2008, 08:47 PM

And just a click away as well.

Proper threw me out as I've never come across this before, just been lucky I suppose.

ligbee.

Title: Re: Chainring Problem.
Post by: mark 2 on April 14, 2008, 08:48 PM

Quote from: crusty on April 14, 2008, 08:44 PM

i told you there be some smart people on 'ere

Too much time on their hands more like :LolLolLolLol: