miktdish

Guns n Chainsaws
Full Member
So here I am tootling along in the D90 and the speedo says 65mph.
Which is nice.

Bur Mr GPS says 57mph, which is a bit different ...

I think (can't remember) I have a blue cog.
I think I need more teeth (?)

A yellow (2 more) or a Red (3 more) ?
 
So here I am tootling along in the D90 and the speedo says 65mph.
Which is nice.

Bur Mr GPS says 57mph, which is a bit different ...

I think (can't remember) I have a blue cog.
I think I need more teeth (?)

A yellow (2 more) or a Red (3 more) ?


The nicest option would be one of the vdo ones with an electronic sender, like the 300 disco.

No more jumpy needle either.

They're about £170 though. Maybe even more.


But, to answer your question, there's certainly a website somewhere with photos of all the drives and descriptions. I just can't remember where (so it doesn't actually answer your question at all!)

If you're thinking of swapping them, start applying penetrating oil now, and, in 3 months time, when you finally get around to the job, it may only take you 3 hours to get it out.
 
I have an advantage ....
It was all new in August ...

WhatsApp Image 2024-08-07 at 17.32.11_c10750ae.jpg


 
So here I am tootling along in the D90 and the speedo says 65mph.
Which is nice.

Bur Mr GPS says 57mph, which is a bit different ...

I think (can't remember) I have a blue cog.
I think I need more teeth (?)

A yellow (2 more) or a Red (3 more) ?
You are over reading by 14% based on the speeds you have given.
yellow will give a 10% decrease in indicated speed based on having a blue currently so 57mph GPS will be 58.5mph indicated
Red will give a 15% decrease in indicated speed based on having a blue currently so 57mph GPS will be 55.25mph indicated
 
GPS signal can have some delay so make comparisons over some distance at constant speed.
 

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