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Technical & Reference Section => Tech and Restoration => Topic started by: highrisedrifter on May 27, 2007, 01:24 AM

Title: Measuring chainwheels / spiders
Post by: highrisedrifter on May 27, 2007, 01:24 AM

Hi there

I recently bought a chainring and a spider to go wth it. However, it seems that the diameter of the spider is too big for the chainring

(http://www.radbmx.co.uk/archive/albums/w217/highrisedrifter/IMG_0077.jpg) (http://www.radbmx.co.uk/archive/albums/w217/highrisedrifter/IMG_0075.jpg)

Can anyone tell me from where to where they are both measured, so that I don't make the same mistake again, please?

Thanks

HRD

Title: Re: Measuring chainwheels / spiders
Post by: MartyC on May 27, 2007, 01:27 AM

I believe that you measure from one hole to the second hole along, almost diagonally if that makes sense  :daumenhoch:

What you have there is a Sugino Ring with a Takagi spider  :daumenhoch:

Title: Re: Measuring chainwheels / spiders
Post by: Coastvl on May 27, 2007, 01:31 AM

Shimano, Takagi and Sugino +whatever else are different spacings obviously.
The Takagi and Shimano sprockets are noticably bigger than the sugino and some others. I can't tell you how to measure them but they are very noticable when you look at them. Your sprocket looks like a Sugino size and the spider is a Takagi.
Most people use the names to distinguish the sizes.

Title: Re: Measuring chainwheels / spiders
Post by: MartyC on May 27, 2007, 01:34 AM

Sugino use 110mm bcd and Takagi 130mm bcd  :daumenhoch:

Updated to 130mm as per the Taffy Geordie  :LolLolLolLol:

Title: Re: Measuring chainwheels / spiders
Post by: mark 2 on May 27, 2007, 01:36 AM

Damien, what you do is......it's called the bolt circle dimension. It's as if there is an imaginary circle running through the centre of the holes and you measure it across. On the chainring you've got in the picture it's 110mm but the spiders 130mm. Sugino's and Suntour chainrings are 110mm, Takagi, Tioga and Shimano are 130mm, some have both like Tuf Neck's.......

Title: Re: Measuring chainwheels / spiders
Post by: highrisedrifter on May 27, 2007, 01:40 AM

Thanks for the help everyone, with the possibly exception of the non sequitur from 69 there.  ;D

So the chainring I have is 110mm and the spider is 130mm.

It makes sense now. Many thanks.

HRD

Title: Re: Measuring chainwheels / spiders
Post by: 69 on May 27, 2007, 01:53 AM

old skool,do the monster stomp

Title: Re: Measuring chainwheels / spiders
Post by: highrisedrifter on May 27, 2007, 02:07 AM

Quote from: 69 on May 27, 2007, 01:53 AM

old skool,do the monster stomp

In the quiet words of the Virgin Mary... come again?

Title: Re: Measuring chainwheels / spiders
Post by: 69 on May 27, 2007, 02:09 AM

LIKE A BAD SMELL

Title: Re: Measuring chainwheels / spiders
Post by: lazychubs on May 27, 2007, 12:12 PM

lucy did ask me if the spider would fit and said yeah as didnt know they came in two sizes

Title: Re: Measuring chainwheels / spiders
Post by: highrisedrifter on May 27, 2007, 05:52 PM

No worries mate. I need another one anyway for another build so it's not a problem.  :daumenhoch:

HRD