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Seatpost Clamps

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Manufacturer	Model	Year	Size	Claimed<	Real	±	Comments
AMP	?	?	?		43.5 g
Campagnolo	Asymmetric	2009	?		25 g		34.9 mm diameter for 31.6 mm seatpost
Campagnolo	Binder Bolt	2000	?		10 g		Steel bolt for integrated seatclamps
Control Tech	?	?	?		12 g		QR bolt Ti
Giant	(OEM)	?	?		29 g
Giant	from TCR ONCE Carbon	2003	?		20 g		incl. CrMo bolt, engraved ONCE logos
IKE	stock on Carrera LRS3	2003	?		61 g		34.9, QR
Scott	OEM on Yecora	2005	?		38 g		QR seatpost clamp
Serotta	OEM on Ottrott	2003	?		25 g		w/ Hex bolt
Specialized	OEM from Epic S-Works	2004	?		43 g		34.9mm, QR
tune	AC9	?	?	20 g	21 g	+5,00%	bolt & lever, averaged (20/22)
ZZYZX	?	?	?		47 g		same as Corratec
Heylight	Titan	2001	24-30 mm		20 g		5 mm QR, not suitable for high force
CODA	OEM	1992	27.2 mm		45 g		QR
Salsa	Liplock	2007	28.6 mm	34 g	32 g	−5,88%	bolt type
Salsa	Liplock	2004	28.6 mm		34 g		bolt type (stock bolt weighs 7 g)
Tranz-X	Mountain	2001	28.6 mm		52 g		QR, silver
Campagnolo	Asymetric	2004	28.6 mm(?)	21 g	22 g	+4,76%	black, incl. w/ Record carbon seatposts
Woodman	Deathgrip	2004	29.8 mm	24 g	23.9 g	−0,42%	bolt-on
Salsa	Fliplock	2003	30.0 mm		44 g		QR
Specialized	FSR Pro	2000	30.9 mm		50 g		QR OEM
Farwell	Ti clamp	?	31 - 32 ID		20 g
Ibis	Mojo SL	2007	31.6 mm		17 g		w/ Ti bolt
Mounty Special	Tec-Clamp	2002	31.6 mm		23 g		bolt
B-T-P	Carbon Clamp	2003	31.8 mm	7 g	7 g	±0,00%	incl. M5 Titanium bolt
Cannondale	OEM on R2000	2003	31.8 mm		23.3 g		steel bolt-on clamp
Colnago	Asso OEM	2003	31.8 mm		24 g		came on Asso frameset
Extralite	The Clamp	2003	31.8 mm	12 g	13.6 g	+13,33%	3.2 g steel bolt + 10.4 g Al clamp
Extralite	The Clamp	2000	31.8 mm		14 g
Extralite	UltraClamp	2003	31.8 mm	9 g	12 g	+33,33%	2 samples weighed, both 12 g
Hope	QR Seatpost Clamp	2006	31.8 mm		53 g
Hope	QR Seatpost Clamp	2003	31.8 mm	52 g	49 g	−5,77%
Hope	Seatpost Clamp	2003	31.8 mm	19 g	19.5 g	+2,63%	bolt clamp, averaged (19/20)
Litespeed	Stainless Steel	2003	31.8 mm		36 g		w/ stainless steel bolt
m2racer	Post Clamp	2005	31.8 mm	8 g	8.5 g	+6,25%
Mounty Special	Tec-Clamp	2008	31.8 mm	17 g	19 g	+11,76%	CNC-machined, incl. bolt, black
Mounty Special	Tec-Clamp	2003	31.8 mm	17 g	16 g	−5,88%	CNC-machined, incl. bolt
PRO	Seatclamp	2003	31.8 mm		19 g		bolt type
Promax	MX-36RT	2007	31.8 mm	18 g	23 g	+27,78%	cold forged alloy clamp for road bikes, anti-rusted steel bolt & nut, black
Red Bull	OEM from Scandium Four (tuned)	2003	31.8 mm		11 g		tuned with M6 Magnesium screw
Salsa	Fliplock	2003	31.8 mm		42 g		QR
Spicer	Titanium Seat Collar	2006	31.8 mm		23 g		3/2.5 Titanium with 5 mm Ti bolt
tune	Würger	2005	31.8 mm	30 g	31 g	+3,33%	red
tune	Würger	2003	31.8 mm		30 g
Woodman	Death Grip SL Ti	2008	31.8 mm	9.5 g	10.7 g	+12,63%	bolt-on
Salsa	Fliplock	2007	32.0 mm	44 g	44 g	±0,00%	QR
Specialized	OEM from S-Works Tarmac SL3	2011	32.6 mm		17 g		Silver Bolt. Marked 11A2
Giant	OEM from XTC Composite	2005	34.0 mm		27 g		incl. 2 steel bolts (stock)
B-T-P	Carbon Clamp	2003	34.9 mm	8 g	8.7 g	+8,75%	incl. M5 Titanium bolt
BBB	The Strangler	2003	34.9 mm		22 g		bolt-on
Bontrager	XXX Lite	2005	34.9 mm	26 g	26 g	±0,00%
Cube	Scape	2002	34.9 mm		48 g		bolt on
DKG	?	2000	34.9 mm		23 g
Extralite	The Clamp	2004	34.9 mm	12 g	14 g	+16,67%
Extralite	The Clamp	2002	34.9 mm	12 g	14 g	+16,67%
Extralite	The Clamp	2001	34.9 mm	12 g	13 g	+8,33%
Extralite	UltraClamp	2004	34.9 mm	9 g	12 g	+33,33%	black anodized
Extralite	UltraClamp	2003	34.9 mm	9 g	13 g	+44,44%
Extralite	UltraClamp	2002	34.9 mm	9 g	12 g	+33,33%	averaged (12/12)
Gary Fisher	OEM (Supercaliber)	2001	34.9 mm		31 g		w/ M6 steel bolt, black anodized
Giant	OEM from ATX series	1999	34.9 mm		27 g		bolt type
Giant	OEM from XTC Napa	2001	34.9 mm		31 g		bolt type
Giant	OEM from XTC series	2003	34.9 mm		29 g		bolt type
Hope	QR Seatpost Clamp	2006	34.9 mm		52 g
Hope	Seatpost Clamp	2004	34.9 mm	19 g	20 g	+5,26%	bolt clamp
Kalloy	?	2003	34.9 mm		22 g		bolted collar
Kalloy	?	?	34.9 mm		67 g
Mounty Special	Compact-Clamp	2000	34.9 mm	50 g	47 g	−6,00%	QR
Mounty Special	Tec-Clamp	2003	34.9 mm		23 g		CNC-machined from 7075 T6 Aluminium, incl. bolt, averaged (23/23)
NOX cycles	Racepin	2008	34.9 mm	20 g	20 g	±0,00%
PMP	COL 34,9	2004	34.9 mm		23 g		CNC 7075 T6 clamp with Titanium bolt
RB Design	SEAT CLAMP CLOSE 1	2005	34.9 mm	26 g	25 g	−3,85%	bolt-type, polished
Salsa	Fliplock	2001	34.9 mm		44 g		QR
Salsa	Liplock	2002	34.9 mm		28 g		bolt type
Scott	OEM from C1 Team Issue	2003	34.9 mm		16 g		bolt-on (steel bolt)
Scott	OEM from CR1 Team Issue (tuned)	2004	34.9 mm		12 g		bolt-on, tuned w/ Ti bolt , 16 g w/ stock steel bolt
Specialized	OEM from Epic S-Works	2003	34.9 mm		52 g		QR
Thomson	SC-E104	2010	34.9 mm	27 g	29 g	+7,41%	bolt type
tune	Würger	2003	34.9 mm		32 g
Woodman	Death Grip SL Ti	2009	34.9 mm	9.5 g	11.06 g	+16,42%	bolt-on
Bontrager	Seat Clamp for Fisher	2006	36.4 mm		22.7 g		Part No. 992551, bolt-type, silver
Gary Fisher	OEM QR seatpost clamp	2003	36.4 mm		46 g		noname
Hope	Seatpost Clamp	2003	36.4 mm	19 g	21 g	+10,53%	bolt clamp
Salsa	Fliplock	2005	36.4 mm	44 g	44 g	±0,00%	QR
Salsa	Liplock	2004	36.4 mm		40 g		bolt type
Klein	OEM QR from Adroit Race	1999	36.4mm		48.5 g		black, '2E' on lever
Scott	Alloy Oversized	2006	38.0 mm		15 g		stock on '06 Scott Scale 20

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Seatpost Clamps

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