Castelli Sale—Save 25% or More on the Latest Apparel »

GT Grade Carbon 105 Complete Road Bike - 2016

Sale $1,749.99 $2,499.99 30% off

Item # GTE0015

Find your size

Note: Actual inseam is not the same as pant inseam.  How to measure

We recommend a size in this bike.

Edit More details

Our size calculator is a starting point for finding the right size for you. To get personal advice talk to one of our fit experts at 1.877.550.2639 or chat now

Select options
  • Select options
  • Raw, 56cm ($1,749.99)
  • 100% Guaranteed Returns
Item # GTE0015

The "it" frame.

Endurance frames are having a moment. We seem to be seeing more and more of these versatile builds with their relaxed geometry and a go-anywhere capabilities every day on the roads, and for good reason. Namely, the pro bikes that we've been stuffing ourselves onto for years serve a very different purpose than riders like many of us need. Plus, the whole gravel adventure thing afforded by a rugged geometry is a blast. With its mountain heritage, GT knows a thing or two about adding ruggedness to a road frame, and its Grade line features an endurance build for every budget. The Grade Carbon 105 Complete Road Bike feels like a responsive race frame but with a more laid-back geometry, the sexy new 105-equivalent hydraulic shift levers, and the same Stan's NoTubes rims as its award-winning sibling, the Grade Ultegra.

GT shapes the Grade Carbon 105 frame and fork using carbon that's reinforced with a glass matrix for equal parts vibration-damping and stiffness to reduce fatigue and wasted watts over long rides. The hallmark of endurance frames, and a major reason for their of-the-moment appeal, is their relaxed geometry. It's perfect for riding a fondo or heading out on a leisurely spin to soak in scenery, but it's still able to keep up in a road race or competitive group ride. The Grade Carbon 105 fits this description aptly, and it also features a slightly more compact rear triangle than other similar frames. that compactness is owed to GT's Triple Triangle, which is designed to add stiffness and rigidity to the frame using tighter angles and reinforced seatstays.

As for the impressive build kit mentioned earlier, GT specs the Grade Carbon 105 with a mix of componentry rarely found on complete bike builds. Except for the 105-in-all-but-name shift levers, the drivetrain is full Shimano 105 — cassette, derailleurs, even cranks — which promises smooth, consistent shifting and reliability that rivals pricier groupsets. Whether you take the Grade Carbon 105 onto gravel bike paths or ride on wet, rainy roads, you won't have a problem achieving reliable stopping power with Shimano's R785 hydraulic disc brakes and levers and 160mm IceTech rotors. When combined with Stan's No Tubes Grail Disc rims wrapped in Continental Grand Sport Race tires, you get a bike that confidently occupies its place in the adventure road category.

  • Shimano 105 drivetrain
  • Carbon fiber construction
  • Endurance geometry
  • Shimano R785 hydraulic disc brakes
  • Stans NoTubes Grail Disc wheels
  • Continental Grand Sport Race tires

Tech Specs

Frame Material:
carbon fiber
GT carbon
1-1/8 - 1-1/4 in
Shimano ST-RS505
Front Derailleur:
Shimano 105 5800
Rear Derailleur:
Shimano 105 5800
52 / 36 t Shimano 105 5800
Bottom Bracket:
Praxis Works PF30 BB adapter
11 - 32 t Shimano 105 5800
Shimano R785
Brake Type:
hydraulic disc
160 / 160 mm
GT DropTune Super Light
3D forged alloy SL
Fizik Aliante R7 Mg
FSA SL-K carbon
Stans NoTubes Grail Disc
Formula 4
Continental Grand Sport Race
Tire Size:
700 c x 28 mm
not included
Recommended Use:
road endurance, gravel
Manufacturer Warranty:
lifetime on frame

sizing chart

Grade size by rider height


Geometry chart


Geometry Chart


Grade Carbon Ultegra/105

Seat Tube


Effective Top Tube






Stand Over

Head Tube


Head Tube Angle


Seat Tube Angle


Bottom Bracket Drop




51cm 49.5cm 51.5cm 53.4cm 36.7cm 74.2cm 12.1cm 69o 74.5o 7cm 43cm 101.7cm
53cm 53.5cm 53.5cm 55.7cm 37cm 77.2cm 14.2cm 70o 73.5o 7cm 43cm 101.9cm
55cm 55cm 55cm 57.8cm 37.3cm 78.6cm 16.2cm 70.5o 73o 7cm 43cm 102.5cm
56cm 56cm 56.5cm 60.1cm 38.1cm 80cm 18.2cm 71.5o 73o 7cm 43cm 103.1cm
58cm 60.5cm 58cm 62.7cm 38.2cm 82.9cm 20.7cm 72o 72.5o 7cm 43cm 103.5cm
60cm 63.5cm 60cm 65cm 38.9cm 84.3cm 23.1cm 72o 72o 7cm 43cm 104.9cm

Reviews & Community


Write a review

    Add a:
  • Photos
  • Videos

No file chosen

Rather attach a photo from your computer?


Only jpg, jpeg, png, gif or bmp files please.

Submit ReviewCancel

can someone tell me the stock stem lengths that come with the bike (L & XL)? thx.

Hey Ray, The 54-56cm size frames are going to have a 100mm stem and 58cm and up are going to have a 110mm stems. Hope that helps! Let me know if you have any other questions and I'd be happy to help - my direct line is 801.204.4547 or you can email me at Cheers, Connor

Unanswered Question

bought this bike about 2 years now front fork falling apart does this have warranty or they can help fix the problem gt 105

Avg. ride time: 2h 9m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Does this bike come with the fork steerer tube pre cut or full length?

Hi Sal, the bike comes with the steerer pre cut.

Avg. ride time: 4h 31m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

In between dirt sessions.

  • Familiarity: I've used it several times

This is my first road bike since 1990. I was looking for a bike that could double as a Cross bike. I looked at the Ridley Xtrail, Salsa, and a Canondale. The GT ticked most boxes and when CC dropped prices the Carbon 105 made perfect sense. I ordered a 53cm frame. I'm about 5'7". First impressions, clean lines, lighter than I expected 19lbs to feel. The 105 shifters are buttery smooth and after 200 miles of dirt and Tarmac they still remain that way. The Stan's wheelset started making a wierd sound the first evening. After some quick Googling I found it to be a common problem with an internal piece used during welding. Not much to do about it. I cannot say anything good about the saddle other than ouch. I have using a LBS seat demo program to find a replacement. I swapped out the front 36 chainring for a 34 for climbing, added a set of Mavic Ksyrium Pro Disc wheels and changed the stem length. I have been really happy with the ride feel of the bike both on and off road. I am scheduled for a real fitting session in 2 weeks to dial in a working position.

In between dirt sessions.

Please send me the GT Grade bike weight.

Hey Dick - This GT Grade Carbon 105 weighs approximately 19.88 lbs. (9.02 kg) in the 55 cm frame size. Feel free to contact me directly if you are interested in ordering this bike or with any additional questions.

- Kyle L. - Expert Gearhead - - 801-736-4337

Grail rims

  • Familiarity: I've put it through the wringer

Spokes break, had to rebuild rear wheel with triple butted 3mm spokes.

Rims rattle. Fixed through tire glue. Weird.

Front rim split whilst fitting tire (was using plastic levers). 25 years riding, this is the first time this has happened.

I weigh 70kg on a 58 frame. Had bike only 6 months.

Grail rims

I have been considering the Grade 105 Carbon for a while as a do-it-all bike, but there seems to be a growing amount of negative reviews for these Grail rims. Sucks to see you having issues with these as well.

Can you comment on the warranty process and whether or not the rims were taken care of?

Unanswered Question

Hi there, I have received my gt grade. All is well except the handing in the brakes is not Australian. Ie the front brake is on the left not the right side. My concern is under a reflex breaking situation, i will initiate the back brake instead of the front.
Would you be happy for me to have this changed at a local bike shop, and charge this back to you?