Aura XR4 2025

~~Colour variants~~

New tripple butted alloy frame with fully Integrated Cable Routing included head setLightweight full carbon fork with 6 threaded bosesSHIMANO GRX 400 / Tiagra components, 20 speedSHIMANO GRX chainwheel, 46-30t.PANARACER GRAVEL KING SK SPORT 700 × 38C tiresPROMAX ergoshaped gravel handlebarsAUTHOR Guru gravel saddle

~~Buy now~~price 37 990 Kč

Technical specification

Size	500, 520, 540, 560, 580 mm
Frame	triple butted alloy 6061
Front fork	AUTHOR carbon, 1.5" tapered
Head parts	PRESTINE Integrated, 1.5" tapered
Chain Wheel	SHIMANO GRX 600, 46-30 teeth, 172,5 / 175 mm cranks
BBParts	SHIMANO BB-RS501, BB unit
Front derailleur	SHIMANO GRX 400
Rear derailleur	SHIMANO GRX 400
Shifters	SHIMANO Tiagra (20)
Free wheel	SHIMANO CS-HG500-10, 11-34 (10)
Chain	KMC X10
Hubs	QUANDO Road Disc, 12 × 100 mm thru front axle, 32 holes
Brakes	SHIMANO RS305, disc mechanical (160 mm rotors)

Brakes levers	SHIMANO Tiagra
Rims	JALCO SRD 21, 32 holes
Spokes	black stainless steel 2.0 mm
Tires	PANARACER Gravel King SK Sport, 700 × 38C (40-622)
Handlebar	PROMAX, 420 / 440 / 460 mm
Tapes	AUTHOR suede / gel
Stem	AUTHOR alloy
Seat post	AUTHOR alloy (27.2)
Seat clamp	AUTHOR (31.8)
Saddle	AUTHOR Guru
Speed	20

Geometry and sizes

Size	480	500	520	540	560	580
Min. figure ~~[cm]~~	153	160	168	176	183	190
Max. figure ~~[cm]~~	162	170	178	185	193	205
S/T c-t ~~[mm]~~	480	500	520	540	560	580
S/T c-c ~~[mm]~~	440	460	480	500	520	540
T/T h ~~[mm]~~	520	530	550	570	590	610
T/T a ~~[mm]~~	505	515	534	553	572	589
H/T ~~[mm]~~	125	135	150	165	180	200
C/S ~~[mm]~~	435	435	435	435	435	435
W/B ~~[mm]~~	1020	1026	1037	1052	1062	1071
S/T ang. ~~[°]~~	74.5	74.5	74	73.5	73	72.5
H/T ang. ~~[°]~~	70	70.5	71	71	71.5	72
F/L ~~[mm]~~	408	408	408	408	408	408
B/B drop ~~[mm]~~	71	70	70	69	68	68
B/B width ~~[mm]~~	68	68	68	68	68	68
Reach ~~[mm]~~	364	371	381	392	402	409
Stack ~~[mm]~~	562	572	588	601	617	638
F/R ~~[mm]~~	45	45	45	45	45	45
Handlebars ~~[mm]~~	0	0	0	0	0	0
Stem ~~[mm]~~	0	0	0	0	0	0
Cranks ~~[mm]~~	0	0	0	0	0	0

maxmin

~~Choose the height of the character by moving the pointer on the scale.~~

The recommended size and stature are just indicative. It is recommended to always consult your choice with the dealer.

S/T c-t - seat tube (center-top), length of the seat tube from the middle of BB parts to its peak
S/T c-c - seat tube (center-center), length of the seat tube from the middle of BB parts to an axle of the upper tube
T/T h - top tube horizontal, horizontal lenght of the upper tube
T/T a - top tube actual, real lenght of the upper tube
H/T - head tube, head tube lenght
C/S - chain stay, chain brace lenght
W/B - wheel base, wheelbase (front and rear axle lenght)
S/T ang. - seat tube angel, angle between the seat tube axis and an imaginary line connecting the axes of the front and rear wheel
H/T ang. - head tube angel, angle between the head tube axis and an imaginary line connecting axes of the front and rear wheels
F/L - fork length, fork length from the head parts bottom to the middle of the front wheel
B/B drop - bottom bracked drop, lenght between an imaginary line connecting wheels centers and BB parts, measured from BB parts
F/R - fork rake, distances between the head tube axis and fork axis measured at center of the front wheel, so-called. off set

Availability

	Colour variant	Size	In stores	Purchase	City	Contacts on seller	Model code
		50	10 stores				42962102
	▪ Bike Servis FRODL		order	order now	Čáslav	603 510 347, mpbike@seznam.cz	map
	▪ SPORT CYKLO s.r.o.		order	order now	Holešov	603 373 886, sportcyklo@gmail.com	map
	▪ CYKLOSPORT H&F		order	order now	Opava 1	777 330 072, info@cyklosporthf.cz	map
	▪ Kola Pešek		order	order now	Pardubice - Staré Čívice	733 706 797, info@kolapesek.cz	map
	▪ KOLA ŠILHAVÝ s.r.o.		order	order now	Plzeň	602 495 439, silhavy@silhavy-ramala.cz	map
	▪ Ramala s.r.o.		order	order now	Plzeň	377 322 435, plzen@ramala.cz	map
	▪ CykloCentrum ESHOP		order	order now	Praha 7	725 085 309, info@cyklocentrum.cz	map
	▪ Jízdní kola Rezek - Rezková		order	order now	Rakovník	313 517 417, jizdnikola.rezek@tiscali.cz	map
	▪ Pavel Brabec		in stock	buy now	Rumburk	602 112 875, brabec.pavel@gmail.com	map
	▪ Flystork		order	order now	Třebíč	530 513 203, obchod@flystork.cz	map
	⟲ In other stores		in 2 days				dealers
		52	11 stores				42962103
	▪ Bike Servis FRODL		order	order now	Čáslav	603 510 347, mpbike@seznam.cz	map
	▪ SPORT CYKLO s.r.o.		order	order now	Holešov	603 373 886, sportcyklo@gmail.com	map
	▪ Cyklo sport Stratílek		in stock	buy now	Hradec Králové	601 379 902, cyklohk@stratilek.cz	map
	▪ CYKLOSPORT H&F		order	order now	Opava 1	777 330 072, info@cyklosporthf.cz	map
	▪ Kola Pešek		order	order now	Pardubice - Staré Čívice	733 706 797, info@kolapesek.cz	map
	▪ KOLA ŠILHAVÝ s.r.o.		order	order now	Plzeň	602 495 439, silhavy@silhavy-ramala.cz	map
	▪ Ramala s.r.o.		order	order now	Plzeň	377 322 435, plzen@ramala.cz	map
	▪ CykloCentrum ESHOP		order	order now	Praha 7	725 085 309, info@cyklocentrum.cz	map
	▪ Jízdní kola Rezek - Rezková		order	order now	Rakovník	313 517 417, jizdnikola.rezek@tiscali.cz	map
	▪ Pavel Brabec		in stock	buy now	Rumburk	602 112 875, brabec.pavel@gmail.com	map
	▪ Flystork		in stock	buy now	Třebíč	530 513 203, obchod@flystork.cz	map
	⟲ In other stores		in 2 days				dealers
		54	10 stores				42962104
	▪ Bike Servis FRODL		order	order now	Čáslav	603 510 347, mpbike@seznam.cz	map
	▪ SPORT CYKLO s.r.o.		order	order now	Holešov	603 373 886, sportcyklo@gmail.com	map
	▪ CYKLOSPORT H&F		order	order now	Opava 1	777 330 072, info@cyklosporthf.cz	map
	▪ Kola Pešek		order	order now	Pardubice - Staré Čívice	733 706 797, info@kolapesek.cz	map
	▪ Ramala s.r.o.		order	order now	Plzeň	377 322 435, plzen@ramala.cz	map
	▪ KOLA ŠILHAVÝ s.r.o.		order	order now	Plzeň	602 495 439, silhavy@silhavy-ramala.cz	map
	▪ CykloCentrum ESHOP		order	order now	Praha 7	725 085 309, info@cyklocentrum.cz	map
	▪ Jízdní kola Rezek - Rezková		order	order now	Rakovník	313 517 417, jizdnikola.rezek@tiscali.cz	map
	▪ Pavel Brabec		in stock	buy now	Rumburk	602 112 875, brabec.pavel@gmail.com	map
	▪ Flystork		order	order now	Třebíč	530 513 203, obchod@flystork.cz	map
	⟲ In other stores		in 2 days				dealers
		56	11 stores				42962105
	▪ Bike Servis FRODL		order	order now	Čáslav	603 510 347, mpbike@seznam.cz	map
	▪ SPORT CYKLO s.r.o.		order	order now	Holešov	603 373 886, sportcyklo@gmail.com	map
	▪ CYKLOSPORT H&F		order	order now	Opava 1	777 330 072, info@cyklosporthf.cz	map
	▪ Kola Pešek		order	order now	Pardubice - Staré Čívice	733 706 797, info@kolapesek.cz	map
	▪ KOLA ŠILHAVÝ s.r.o.		order	order now	Plzeň	602 495 439, silhavy@silhavy-ramala.cz	map
	▪ Ramala s.r.o.		order	order now	Plzeň	377 322 435, plzen@ramala.cz	map
	▪ CYKLO ADAM s.r.o.		in stock	buy now	Praha 6	775 085 151, info@cykloadam.cz	map
	▪ CykloCentrum ESHOP		order	order now	Praha 7	725 085 309, info@cyklocentrum.cz	map
	▪ Jízdní kola Rezek - Rezková		order	order now	Rakovník	313 517 417, jizdnikola.rezek@tiscali.cz	map
	▪ Pavel Brabec		in stock	buy now	Rumburk	602 112 875, brabec.pavel@gmail.com	map
	▪ Flystork		order	order now	Třebíč	530 513 203, obchod@flystork.cz	map
	⟲ In other stores		in 2 days				dealers
		58	10 stores				42962106
	▪ Bike Servis FRODL		order	order now	Čáslav	603 510 347, mpbike@seznam.cz	map
	▪ SPORT CYKLO s.r.o.		order	order now	Holešov	603 373 886, sportcyklo@gmail.com	map
	▪ CYKLOSPORT H&F		order	order now	Opava 1	777 330 072, info@cyklosporthf.cz	map
	▪ Kola Pešek		order	order now	Pardubice - Staré Čívice	733 706 797, info@kolapesek.cz	map
	▪ Ramala s.r.o.		order	order now	Plzeň	377 322 435, plzen@ramala.cz	map
	▪ KOLA ŠILHAVÝ s.r.o.		order	order now	Plzeň	602 495 439, silhavy@silhavy-ramala.cz	map
	▪ CykloCentrum ESHOP		order	order now	Praha 7	725 085 309, info@cyklocentrum.cz	map
	▪ Jízdní kola Rezek - Rezková		order	order now	Rakovník	313 517 417, jizdnikola.rezek@tiscali.cz	map
	▪ Pavel Brabec		in stock	buy now	Rumburk	602 112 875, brabec.pavel@gmail.com	map
	▪ Flystork		order	order now	Třebíč	530 513 203, obchod@flystork.cz	map
	⟲ In other stores		in 2 days				dealers
Poznámka: Stav dostupnosti kola se aktualizuje 1× denně v ranních hodinách.

additional accessories

1/15

250 Kč ~~299 Kč~~ PRO33 g • The AUTHOR PRO Bottle Cage is light, designed for easy bottle entry / removal on the go. Great to ... more »

1/11

450 Kč ~~595 Kč~~ X26 KarbonCreated using AUTHOR X26 Carbon - tech construction is superbly strong and incredibly light. Elegant ... more »

1/9

425 Kč ~~475 Kč~~ R255 Tank Bag MPPThe AUTHOR Tank Bag MPP ensures your camera is at hand in any situation. It provides easy, hassle-fr ... more »

1/6

425 Kč ~~499 Kč~~ R260 ProLongThe Author saddle bag A-R260 ProLong is the universal bag with the one main compartment and one flat ... more »

1/4

399 KčR270The Author saddle bag A-R270 16" is the universal bag with the one main compartment and one flat poc ... more »

1/5

399 KčR290 Energy BagNYLON 420DThe AUTHOR A-R290 Energy Bag ensures your necessary items are at hand in any situation. It provides ... more »

1/6

895 KčS3152 SuMo X9 The AUTHOR SuMo big seat bag for big trips. Take it on the every route - easy strong fixation for ... more »

AUTHOR Hand pump AAP Fatty X23 AL/Composite

1/4

350 KčFatty X23 AL/CompositeAlloy • 120 psi • 129 g • The AUTHOR Fatty X23 AL mini pump provides fast and simple tire inflation with a maximum pressure of ... more »

1/2

399 KčAKS-530 RSAlloy kick stand designed for direct rear fork down tube fixation (tube profile 22 - 32 mm), recomen ... more »

1/6

595 KčQUANTUM 750 lm L-Run USB AlloyCREE XP-G3 LED 750 lm • LED battery indicator • Safe Ride Home Mode • USB-C • AlloyThe AUTHOR QUANTUM 750 lm L-Run is a USB rechargeable headlight with a CREE XP-G3 LED 750 lm output. ... more »

AUTHOR Rear Light Cubus/Brake USB CobLed 70 lm Alloy

1/4

550 KčCubus Brake USB CobLed 70 lm20 COB LED & XPE RED • Alloy case • Brake Sensor • Safe Mode • The AUTHOR CUBUS 70 lm with the brake sensor and new optical lens technology is clearly seen from wi ... more »

1/3

695 KčACR-16-AlloyA tough rear rack AUTHOR ACR-16-Alu. Equipped with adjustable legs to fit most 24” to 29” wheel ... more »

1/5

160 Kč ~~199 Kč~~ X-Bow CrossThe mudguard AUTHOR X-Bow Cross with fast and easy clipping system on seat tube will make the lazies ... more »

1/2

199 KčX-Flap SeatThe mudguard AUTHOR X-Flap with fast and easy clipping system on saddle rails will make the laziest ... more »

1/6

695 KčACR-F05-AluALLOY • 163 g • The AUTHOR CARGO F05 is the perfect combination of bottle cage and bicycle rack. Designed to carry b ... more »

199 KčX-Mudy CrossFront mudguard AUTHOR, for down tube mounting, fabric plastic. more »

Aura XR4 2025

Technical specification

Geometry and sizes

Availability

Product options

additional accessories