linux: awk to view free memory

free | grep Mem | awk '{print $3/$2 * 100.0}'

Trek district belt drive conversion to chain

I loved this bike so much I bought a second hand replacement when my shop-new one was stolen.  Unfortunately the second-hand one had a very tight belt setting.  A few months later and the belt is jumping and free rotation of the crank presents a vibration to the pedals.  I think the bottom bracket bearings need replacing.  (I was wrong!)

I started with the rear wheel bearings however, as it felt like they'd failed too; and were easier to approach.  The wheel and bits are lying around the house now as I had some difficulty with them.

Anyway....

what is the required part for the bottom bracket?

http://www.chainreactioncycles.com/bottom-brackets?&utm_source=google&utm_term=Generic&utm_campaign=UK_Generic_Cycle_Components_Bottom-Brackets_B&utm_medium=cpc&utm_content=mkwid|sZ7uj0sgc_dc|pcrid|183363587263|pkw|%2Bbottom%20%2Bbrackets|pmt|b|prd|

sells many.  Can they help?

According to

http://wheelsmfg.com/bb90-tech-info

it's a case of replacing two bearing shells that are knocked out of the frame from the opposite side.  Sounds straightforward! "The BB90/95 standard is currently used by Trek."

http://wheelsmfg.com/bottom-brackets.html

is the sales part.  Maybe they sort by bike.


According to

http://www.parktool.com/blog/repair-help/bottom-bracket-service-bb90-bb86-bb92-gxp-press-fit#article-section-3

http://www.parktool.com/blog/repair-help/bottom-bracket-service-bb90-bb86-bb92-gxp-press-fit#article-section-4

It looks straightforward.  Less talk, more summary:

List of bike manuals:  maybe bb90 is mentioned for the trek district:
http://www.bike-manual.com/brands/trek/om/welcome/index.htm

Trek support site:  useless.
http://archive.trekbikes.com/gb/en/2011/trek/district#/uk/en/support

Interestingly, the more expensive bikes have the bb specified at Trek.

If  it's 200 quid for a working one, maybe go that way:
https://www.gumtree.com/p/bicycles/trek-district-2011-single-speed-carbon-forks.-price-negotiable/1172427732

Trek parts:  maybe call these people:
http://www.jejamescycles.com/parts/frames.html?limit=36&manufacturer=415


Expensive ceramics:

https://r2-bike.com/KOGEL-BEARINGS-Bottom-Bracket-TREK-BB90-Road-Seals-Ceramic-for-24-mm-Spindle-/-SRAM-GXP

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The right answer:

The rear wheel bearings HAD gone and the pedal bearings are worn.  Rotating the crank gave the vibration feeling.  Anyway, at over 100 pounds to replace the belt and rear sprocket I changed to chain.

I read http://bestandworstever.blogspot.co.uk/2013/07/trek-district-chain-conversion.html

I bought:  front chainwheel is  a 130 BCD 5 connection 55T object.  I changed to a 130 BDC 5 connection 46T object from www.velosolo.co.uk.  About 35 quid.

A 5 quid chain.  Better value than the 60 Euro belt.  ;)

A 16T rear, single speed sprocket in a single-speed conversion kit including spacers from wiggle.

The machine looks gorgeous at the moment.  On completion I'll throw a picture on here.


Anyway. A month later the damn bike got stolen from St. Neots. I'm sick of this shit.