Check out what heavy trials does to your bike. All the nasty failures and wrecked metal you can expect from gnarly concrete edges. See my bike in details, and some of the other bikes that I've had or destroyed.

Answers about trials bikes
Custom trials geometries

Bicycle Parts
BRAKES:
I like the V-brakes, but the HS33 from Magura are much stronger
Magura
Shimano
Tektro
Grimeca
Clarks cables
Coda

CRANKS/CHAINRINGS:
Middleburn
Raceface
Shimano
Stronglight
Sram
FullSpeedHead

FORKS:

Forget about suspension forks if you are into trials riding.


Rockshox
Manitou
Marzocchi
Hanebrink
White Brothers

HUBS:
Hope.

RIMS/WHEELS:
Mavic
Mojo

SADDLES:
San Marco.
Italia seats.

STEMS/HANDLEBARS:
Roox
Azonic
Art bicycle
X-lite components
Ritchey

TYRES:

I like the 2.35" IRC Missiles or the 2.3" Panaracer FireDH Pro


IRC
Bontrager
Geax
Lickbike
Nokian
Panaracer
Schwalbe
Tioga

VISIBILITY:
Cateye lights.
Bike Manufacturers
Bikes 4 Trials: UK-based trials shop
Avanti
Base Bikes (dirt and trials)
Be One (trials)
Bianchi
Brisa Bikes (trials)
Blaker's
Cannondale
Caribike
CheetaCycles
DDG (trials frames)
Decathlon
Diamondback
DMR (dirt and trials frames)
Easton
Echo (trials)
Ellsworth bicycles
FRM
Full Speed Head
Giant
Goldtec
GT bikes
GT Freestyle BMX
Hoffmann Bikes (trials)
Identiti (trials)
KHS
Koxx (trials)
Kona
Lapierre
Look
Marin
MBK
Mission Cycles (trials frames)
Monty (trials frames)
Norco bikes (trials frames)
Onza (trials)
Orange (dirt and trials)
Pace Racing
Pashley (trials frames)
PlanetX (dirt and trials)
Raleigh
Red-Hot-MTB
Saracen
Schwinn
Scott
Specialized
Spen
Sunn
Sun bicycles Cruisers and retro stuff.
Taillefer Bicycles
Tioga (trials frames)
Trek
Turner
Vario (trials frames)
Wheeler
Yeti
Yess Pro (bmx)
Zoo Bikes (trials)