BB spindle length.

[mac-highlander]

Hi,
I was wanting to fit a SR Sakae SX triple chainset to my 130 rear dropout spaced Dawes galaxy. Now the spec for cranks says it needs a 127.5mm bb spindle length.

Would I be right in assuming I’d need to loose some length off that to fit on a 130 spaced dropout rear end. My first guess would be 5mm off length to loose 2.5mm per side.

Can anyone confirm this or help point me in right direction for bb spindle length. Also assume other length I need would just be width of the bottom bracket she’ll on frame and assume English threaded.

Cheers

 

[Vapin' Joe]

The reason the spindle length is 127.5mm is to prevent the inner ring fouling on the chainstay, any shorter and it is likely to. It should not effect the chainline.

 

[mac-highlander]

Yes but chainline on an 8 speed 130mm dropout road bike will be nearer centre line than 8 speed 135mm drop out mtb. And assume chain stay will be a similar amount inboard so won’t fowl if I adjust by correct number (assuming 2.5mm per side so 5mm total)