For all your local cycling needs, try the local shop, BG cycles at 48 High Street, Portobello (http://www.bgcycles.co.uk). Proprietor Bernard is supportive of the club and will do his best to source components at fair prices, or deal with your mechanical problems.
Just slightly further away is ACE Bikes, at 101 North High Street, Musselburgh. It has a good selection of road bikes, and can source most good quality parts and accessories. They offer Porto-Velo members a 10% discount on all bikes, parts etc. bought in-store, or a 20% voucher to spend in the shop when you order from them online: https://www.acebikeco.com/
At Tribe Porty (Windsor Place, Portobello), you will find Velow Bikeworks, specialising in sympathetic restorations of vintage steel and other used frames, plus vintage parts and repairs. Find them at: http://www.velow.cc/
If you want to take your favourite bike on holiday, you can hire a pro-quality box from an Edinburgh-based firm – go to www.bikeboxhireedinburgh.co.uk and enter freevelo as the code to get free delivery and collection.
Pedal on Parliament promotes safer cycling for all. It has organised an annual mass ride from the Meadows to the Scottish Parliament each year since 2012. Portovelo cyclists have been there, among thousands of others. For info, go to: http://pedalonparliament.org/.
Also well worth supporting is Spokes, the long established Lothian cycling campaign, which works hard to promote cycling as a means of transport: http://www.spokes.org.uk.
Sustrans is a UK wide charity commited to delivering dedicated cycle and walking routes. A section of their website documents the National Cycle Network paths: https://www.sustrans.org.uk/national-cycle-network/
For some useful tips on avoiding bike-theft, check this out: https://www.directline.com/home-cover/how-to-prevent-your-bike-from-being-stolen