Dolan DF4 chainline

Posted on Mon 27th, March 2017

• #1

scultura

I have the above frame which is currently running a Sugino DD75 crank on what I believe is a 103mm bottom bracket with a Zipp super9 rear disc.

I have decided to upgrade to a track specific SRM however I am having trouble with the bottom bracket. It requires an octalink bb but these only come in 109mm.,

Can anyone help ascertain which parts I need to get the correct chainline. Also let me know if you need any further info.

Thanks
• #2

Scilly.Suffolk

Different cranks need different BB for the same chainline: just because crank X needs a certain BB, it doesn't follow that crank Y will use the same one.

If the SRM is track specific then presumably it has a 42mm chainline.

Provided that you're currently running 42mm, then you won't need to tweak anything.
• #3

PhilDAS

You're mentioning 2/3 different types of bottom bracket here. 75DD is external so won't be 103mm, its just two cups and the axle is on the cranks. 75s are square taper. and then there's octalink.
• #4

deleted

Have you tried whacking it with a hammer?

Post a reply
- Bold
- Italics
- Link
- Image
- List
- Quote
- code
- Preview
Formatting Help

Don't worry about formatting, just type in the text and we'll take care of making sense of it. We will auto-convert links, and if you put asterisks around words we will make them bold.

Tips:

Create headers by underlining text with ==== or ----

To *italicise* text put one asterisk each side of the word

To **bold** text put two asterisks each side of the word

Embed images by entering:
![](https://www.google.co.uk/images/srpr/logo4w.png)
That's the hard one: exclamation, square brackets and then the URL to the image in brackets.

* Create lists by starting lines with asterisks

1. Create numbered lists by starting lines with a number and a dot

> Quote text by starting lines with >

Mention another user by @username

For syntax highlighting, surround the code block with three backticks:

```
Your code goes here
```
Just like Github, a blank line must precede a code block.

If you upload more than 5 files we will display all attachments as thumbnails.

For a full reference visit the Markdown syntax.