Gruppo

Casgliad trefnus o ddarnau mecanyddol gwneuthurwyr cydrannau beic yw gruppo (o'r Eidaleg am "grŵp") neu groupset yn Saesneg. Mae'n cyfeirio fel rheol at bob cydran sydd yn y beic heblaw am y ffrâm, fforch, stem, olwynion, teiars, a'r pwyntiau cyswllt y reidiwr, megis y cyfrwy a'r barrau llywio.

Mae fel arfer yn cynnwys y darnau canlynol:
 2 liferau neu symudwyr gêr a
 2 liferau brêc neu
 2 liferau/symudwyr brêc cyfannol
 2 caliperau brêc, blaen a chefn
 2 derailleurs, blaen a chefn
 1 blaenset
 1 braced isaf
 1 set cranciau
 1 cadwyn
 1 casét
 1 postyn sedd
 2 both, blaen a chefn
Pâr o bedalau
Amryw o geblau ac amgaeadau cebl.
Except for special commemorative versions, manufacturers do not actually package the various different component together to be sold by retailers as a complete groupset. Therefore when a modern road groupset is bought after-market (as an upgrade for an older bike, or for someone building their own bike), the customer can choose which parts they require, the price of the groupset is just the individual prices of the chosen parts added together.
Y prif wneuthurwyr gruppo cydrannau beic yw Shimano, SRAM a Campagnolo ar gyfer beiciau rasio, a Shimano a SRAM ar gyfer beiciau mynydd. 

Mae'r gwneuthurwyr fel arfer yn cynnig dewis o sawl gruppo, gyda phob un wedi ei anelu at gyllid neu ddefnydd gwahanol. Er enghraifft, mae Dura-Ace, Record a Red yn gruppos o safon uwch ar gyfer rasio gan Shimano, Campagnolo a SRAM. List of Groupsets for 2007
Below is a list of three current manufacturer's groupsets for Road and MTB applications, each manufacturer's offering is arranged in descending quality. The number of sprockets of the cassette in each groupset is shown in brackets. This is often referred to as "10-speed" or "9-speed" meaning the number of sprockets, but the total number of gears is determined by this number multiplied by the number of chainrings, for example a bike that has a double chainring and a 10-speed cassette has 20 gears. However in practice the number of usable gear ratios is usually fewer as several of the gears may be the same ratio or may not be reachable due to the crossover of the chain.

Road
Shimano - 2008

 Dura-Ace (10)
 Ultegra (10)
 105 (10)
 Tiagra (9)
 Sora (8)
 2200 (8)

Campagnolo - 2008

 Record (10)
 Chorus (10)
 Centaur (10)
 Veloce (10)
 Mirage (10)
 Xenon (10)

Campagnolo is also offering 3 new triple chainring offerings from 2007 (for steep hill-climbing). Ordered from the highest to the lowest quality, these are:
 Comp Triple (10)
 Race Triple (10)
 Champ Triple (9)

SRAM - 2008
In 2006, SRAM released two groupsets for racing bicycles, aimed at competing with Shimano and Campagnolo's offerings. The top SRAM groupsets are called 'Red' and 'Force', being the pro-level and amateur racing level lines, respectively.
 Red (10)
 Force (10)
 Rival (10)

Beicio Mynydd yn gyffredinol

Shimano - 2007
 XTR (9)
 Deore XT (9)
 Deore LX (9)
 Deore (9)
 Alivio (8)
 Acera (8)
 Altus (8)
 Tourney (8)

SRAM

Mae SRAM yn gwerthu darnau o dan amryw o wahanol enwau brand:
 Symudwyr, Cadwyni, Casetiau - SRAM
 Caliperau Brêc - Avid
 Set Cranciau - Truvativ
Mae gan pob brand ddewis hefyd, gyda dranau o ystod o gost a gwneuthuriad. Er engraifft, 'hierarchaeth' symudwyr SRAM yw:
 X-0
 X-9
 X-7
 SX 5
 SX 4
 3.0

Arbennigol
 Shimano Dura-Ace (trac) - (1) - Beiciau trac
 Campagnolo Pista - (1) - Beiciau trac
 Campagnolo Time Trial - (N/A) - Cydrannau treial amser gyda liferau rheoli ar bennau'r barrau llywio, cylchgadwynau gyda nifer mwy o ddannedd nag arfer a liferau brêc ysgafn wedi eu creu o ddeunydd cyfansawdd.
 Shimano Hone - (9) - Enduro a Freeride
 Shimano Saint - (9) - Downhill a defnydd trwm arall
 Shimano Nexus - (N/A) - Geriad both mewnol (planedol)
Dolenni allanol
Campagnolo
Shimano (Ewrop)  a Shimano (Gogledd America)
SRAM

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