Friday, December 29, 2006

First new bike in 22 years

After years of secondhand bikes, project bikes made from garage detritus, and Grandfather's Axe bikes, I gave myself a GT Peace 9r for Christmas.

For the last few summers I have not done much mountainbiking, spending most of my spare summer time at Manukau Velodrome, but this year I'm determined to get dirty on a regular basis.

Despite owning an under-utilised GT I-Drive, I figured that the Peace 9r was a way to try out both singlespeeding, and 29-inch wheels in one affordable package.

Needless to say, I started fiddling with it as soon as it came out of the carton. A Cane Creek Thudbuster immediately replaced the original seatpost- I'm 45 years old, and there's no way I'm riding a hardtail off-road without it.

The Q factor of the Truvativ Blaze cranks was a bit wide for my roadie sensibilities and manky knees, so they and the Howitzer bottom bracket, were consigned to a cardboard box, and replaced by a set of 180mm Ritchey Logic crankarms on a square taper Kajita BB.
This opened another can of worms. The 110pcd Ritchey cranks take a 34t chainring, so Rick Woodward gave me a Shimano 19t sprocket to equal the original 32 x 18 gearing. As it turns out Hyperglide cogs don't do much to keep the chain on, but fortunately I have found an old Shimano Uniglide 19t cog that should be more secure

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Blogger JX:ATG said...

I'd recommend tracking down some single-speed cassette cogs. Regular 8/9 speed cogs from multi-gear cassettese are very thin (wear out fast), don't have deep enough valleys between teeth (substandard engagement), and have oddly shaped/angled teeth for ease of shifting (adding noise/friction and poor engagement).

Shimano makes some very affordable ones (in the 3 to 5 USD range), Surly makes some finer/more expensive ones and there are several other manufactures to fill out the range. Sizes range from about 13t to up through the 20s. Since they are so affordable you could get several and experiment with gearing.

Good luck and have fun riding!

6:57 AM  
Blogger David Benson said...

Thts exactly what I did- currently I'm running Surly ring & cog, 36 x 21, with a 35t ring on backorder.

4:21 PM  

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