Just when you thought it was safe to revisit this blog and not see something that dissappears up its own black hole about gear ratios: i'm going to talk gear ratios.
Lets say that following on from a pretty bumpy 12 hour race you have another bumpy 12 hour race coming up. You might have a history of doing ok in that race and it may be the one race you look forward to (in the uk at least) more than any other. Buuut the last time you did it you were nearly reduced to tears by back and arm pain due to riding on the baked hard course on an uncompromisingly rigid forked bike with narrow tyres at high pressure. Something has to give, right?
This is where i am.
At Newcastleton i used high volume Conti race kings at 20psi. This was a good thing. The Jones was pretty comfy for the most part, just a little jangly on some of the washboard sections. It was awesome to ride through the singletrack...but lets say i want to race a bike with a suspension fork at Bristol Bike Fest....especially if it is as baked hard under-tyre as last year.
However, the Vertigo frame has no chain tensioning bits. Fortunately. FixMeUp! provides a way to calculate what cog and chainring combos might work for a given chainstay length....
Once all this goes into the melting pot i'm left with several options that will potentially allow me to 'magic gear' the Vertigo for Bristol.....35x19, 39x23, and 34x20. These all fall at very slightly different chainstay lengths, so one or the other should fit, especially if i try combos with new or used chains...
Other things to look at:
Entries open for SSUK 11.
As is SSUSA.
New Black Owls visuals.
Issue 3 of Privateer is out. If you want a more cerebral mtb magazine, get it.