trek front isospeed assembly

What is Trek IsoSpeed Technology?

Part comfort, part suspension, Crank Boutique explains one of Trek’s key pieces of proprietary bicycle technology.

Technology in Short

While compliance and “suspension” systems are now not uncommon for road bikes (see Specialized’s Roubaix and Diverge), arguably Trek were the first mainstream brand to integrate these systems into some of their key models.

• Manufacturer: Trek
• Technology Type: Suspension, Compliance
• Availability: Proprietary – Trek bikes only
• Cost: N/A. Isospeed tends to come only on higher end models
• Current Road/Gravel Models:   Boone ,  Checkpoint ,  Domane ,  Madone

What is Trek IsoSpeed?​

To the casual observer the biggest difference between road and mountain bikes has been the size of the tyre and attached suspension. Over the last few years however, these strict definitions have started to erode in the pursuit of adventure and comfort. With the former 700c tyres get wider every year and the gravel/adventure category mean bigger tyres for everyone. With the latter a number of manufacturers have introduced “suspension” platforms in their road bikes, including BMC, Wilier, Specialized and Trek’s IsoSpeed. 

While the term “suspension” may be mis-leading, the IsoSpeed system is designed to provide riders with more comfort and control over rougher surfaces and was originally designed by Trek to give their bikes and riders an edge in the Classics – e.g. the Paris-Roubaix. The system works by “decoupling” key parts of the bike to provide more compliance and less rigidity – resulting in a more comfortable ride. IsoSpeed is one of the most mature road “suspension” systems out there, debuting in 2012. The Trek IsoSpeed system has two components:

The IsoSpeed Read Decoupler is a essentially a “hinge” that sits between the seat tube and top tube of the bike. On IsoSpeed equipped bikes the seat tube and top tube are not physically attached but are mechanically joined by the rear decoupler. This means that the seat tube has a range of rearward moving helping to absorb the shocks of riding on things like cobbles, rough roads or gravel. There are a couple of implementations of the platform depending on the bike model – the Emonda uses a slightly different implementation with more adjustment along the top tube owing to its unique frame shape and rarefied price point…

The Front Decoupler is slightly more complicated. The Front IsoSpeed is a proprietary headset collar with a rocker that sits in the top of the head tube and bolts into the steerer tube via an assembly that includes a couple of bolts and a preloaded spring. Obviously you won’t be railing berms or going down a double black on it, but this setup allows for a degree of back and forth movement in the steering tube and help to deflect some of the chatter out of the handlebars.

Note that some bikes may have the rear decoupler without the front headset decoupler. IsoSpeed is available across Carbon and Aluminium models in the Domane and Madone ranges. It is also available on a number of Trek CX and gravel models (including Boone and Checkpoint) and some of their XC MTB range. Watch some videos of the system in action below.

This video from Peloton TV is on an older model – check out the classic Dura Ace – but it’s a perfect introduction to how the Isospeed de-decoupler works in practice.

Does Trek Isospeed Work & How Has It Reviewed?

The CrankBoutique team have only had occasion to ride one IsoSpeed equipped bike – a Domane on some very smooth roads south of Sydney. Lovely bike as it was we can’t really comment on its comfort chops on rough roads although we certainly didn’t get any loss of power.

We haven’t found any reviews of the system in isolation, but there are a few comparative reviews of IsoSpeed equipped bikes vs competitors, including Specialized’s Future Shock:

2018 Trek Domane SL 5 Review

“The first time you hit a patch of corrugated or fractured tarmac you understand what IsoSpeed does. Rather than undulations deflecting the front wheel, it absorbs and nullifies the effect of quite big hits, keeping the wheel straight and giving a smoother ride. The rear end removes jarring vibrations that can fatigue muscles faster, helping you ride for longer…IsoSpeed’s bump absorption irons out small undulations to allow the 25mm tyres to grip more consistently, and even though the Bontrager rubber measures 26mm on the 28mm wide rims, if unaware, you’d think you were riding on 28mm tyres.”

2018 Trek Madone SLR 9 Disc Review

I’ve ridden the Trek Madone SLR 9 Disc in various IsoSpeed modes to discover what difference to the rear it would make. I learnt that I probably wouldn’t ride in the stiffest setting as it was a little too harsh at the rear for me.

Towards the middle and softest setting was my preferred mode and I could altogether forget I was riding such a racing machine, let alone an aero road bike that more often than not is too hard to ever be called comfortable. To be frank about the bike’s stiffness, I couldn’t really tell that I was getting anything less from the bike in the softest setting, it still whipped up a storm no problem.

Cycling Weekly

2018 Trek Boone RSL Review

I quickly noticed the compliance provided by the front IsoSpeed decoupler. The front end of the Boone softened the park bumps and helped absorb some of my less-than-stellar moves on singletrack. Especially given my bad back, having some shock absorption on the front improved the ride quality….Smoothing out a ride is one thing, but does the front IsoSpeed handicap actual racing by hindering accelerations out of corners or finishing sprints? I pushed the Boone RSL frame through several practice sprints and found the only limiter to be my lack of sprinting pop.

CX Magazine

2020 Trek Domane SLR First Ride Review

No doubt about it – the IsoSpeed system is impressive. That said, we question whether so much technology (and compromises in terms of cable routing) are needed to improve comfort. On balance and purely in comfort terms, the answer is probably no. After all, there are other bikes that offer the same or even better comfort levels. However, in terms of individualisation and tuning it to the rider’s weight, the IsoSpeed system offers an effective solution and will wow tech enthusiasts who appreciate the packaging of complex technology into a classic and inconspicuous design. Set up correctly, it results in well-balanced comfort between the front and rear and convincing vibration damping!

Are There any Known issues with Trek IsoSpeed?

Headset Creaking

Some users report that IsopSpeed equipped headsets have excessive creaking – see link above.

Cable Rattle

Some users report that IsopSpeed equipped bikes have excessive cable rattle – see link above.

Bearing Maintenance

Some users report that IsopSpeed equipped bikes required additional bearing maintenance – see link above.

One reply on “ What is Trek IsoSpeed Technology? “

Charles Cox

I bought the 2021 Trek Domane SL5 and have creaking issues in the front end bringing it back to the dealer 2 times already currently in the dealer right now for the third time come on Trek get it right.

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Summary of Contents for Trek DOMANE SL 2023

• Page 1 2023 DOMANE SL/SLR SERVICE MANUAL Rev 1 December 2022...
• Page 2 If threadlocker is not applied, the fasteners may loosen which could damage the bicycle and result in injury to the rider. Copyright 2022 Trek Bicycle Corporation All Rights Reserved...
• Page 3 2023 Domane SL/SLR Routing — mechanical 6.5Nm 0.7Nm Cable housing grommet — W329119 Front derailleur cable Housing grommets — W330578 Rear derailleur cable W531901 Front derailleur hanger — Rear brake hose Front derailleur hanger bolt (M5x16mm) — W543903 Front brake hose Cable guide bolts (M4x9mm) —...
• Page 4 2023 Domane SL/SLR Routing — mechanical: instructions Route the brake hoses. Insert the shift housings and rear brake hose into the cable guide. Route the shift housings.
• Page 5 2023 Domane SL/SLR Routing — Di2 6.5Nm 0.7Nm W330578 Housing grommets — Rear Di2 wire EW-SD300-I Front derailleur hanger — W531901 Front Di2 wire Front derailleur hanger bolt (M5x16mm) — W543903 Rear brake hose Cable guide bolts (M4x9mm) — W546731 Front brake hose Cable guide —...
• Page 6 2023 Domane SL/SLR Routing — Di2: instructions Route the brake hoses. Insert the rear brake hose into the cable guide Route the Di2 wires through the frame and connect them to the battery. Install the battery assembly.
• Page 7 2023 Domane SL/SLR Routing — eTap 6.5Nm 0.7Nm Front derailleur hanger — W531901 Rear brake hose W543903 Front derailleur hanger bolt (M5x16mm) — Front brake hose Cable guide bolts (M4x9mm) — W546731 Rear derailleur hanger — W524188 Cable guide — W588188 Rear derailleur hanger bolts (M3x12mm) —...
• Page 8 2023 Domane SL/SLR Routing — eTap: instructions Route the brake hoses. Insert the rear brake hose into the cable guide.

Page 9: Fork And Headset

• Page 10 2023 Domane SL/SLR Fork and headset: max spacers WARNING WARNING Below the stem Above the stem Do not exceed 40mm of headset spacers below the Do not exceed 40mm of headset spacers above the stem. If there are more than 40mm of spacers, the stem.
• Page 11 2023 Domane SL/SLR Install the fork Install the compression plug in the fork. Grease the fork crown race, both headset bearing bores, and both bearings (13). 9-10Nm Insert the fork into the head tube. TIP: Use a sprint stand to hold the fork in place.
• Page 12 2023 Domane SL/SLR Install the headset Route the headset parts down the housings. Loosely attach the stem (6). Install the top cap (3) and tighten the top cap bolt (1). eTap/Di2 Mechanical Tighten the stem bolts (4) — alternating between them —...
• Page 13 2023 Domane SL/SLR Fork and headset — standard stem Top cap bolt Top cap W547432 Compression plug 5.2Nm Spacers (5mm) — 5253930 Spacers (10mm) — 5253931 5.2Nm Stem bolts (M5x18.5mm) 5276082 D-nuts (M5) Bearing cover (standard stem) — W5274615 Split ring — W5274269 Headset bearings —...
• Page 14 2023 Domane SL/SLR Seatpost MINIMUM INSER T 8-10Nm If the seatpost is continually slipping, add carbon friction paste at the location shown above. Seatpost (280mmx5mm) — W5285077 Bolt insert Barrels 272628 Saddle clamp ears (7mmx7mm) — 421564 Bolt (M6x16mm)

Page 15: Iso Speed

• Page 16 2023 Domane SL/SLR IsoSpeed: remove parts NOTICE: Do not perform routine maintenance on the IsoSpeed. Only service IsoSpeed hardware if you are replacing parts. Remove the assembly cover (9). Remove the pivot bolt (5), washers (2, 3), and the nut (6).
• Page 17 2023 Domane SL/SLR IsoSpeed: install parts NOTICE: Do not perform routine maintenance on the IsoSpeed. Only service IsoSpeed hardware if you are replacing parts. IMPORTANT: Clean all parts before reinstalling them using 50/50 isopropyl/water mix. Grease the wedge assembly as shown below. Place the wave washer (2) on the pivot bolt (5) and apply grease as shown below.
• Page 18 2023 Domane SL/SLR Chainkeeper Bolt (M4x22mm) Chainkeeper 5305773 Flat washer (M5x10mm) Bolt (M5x16mm) Adjust the chainkeeper Shift to the lowest gear (largest rear cassette cog) and inner chainring. Loosen the bolt (1) on the chainkeeper. Rotate the loose piece (shown in red below) so there is 1mm of horizontal clearance to the chain. Tighten the bolt (1) to 1Nm.
• Page 19 2023 Domane SL/SLR Storage door 1.2Nm 1.2Nm Mount screws — W547053 Storage door kit* W596821 Bolts (M5x16mm) — Door frame — W580769 *This is a color-matched part — search trekbikes.com find the right color for your bike.

Page 20: Specifications

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Vibrations of fuel-element bundles in VVER fuel assemblies excited by turbulent coolant flow

• Published: 21 December 2012
• Volume 113 , pages 153–162, ( 2013 )

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• Yu. G. Dragunov 1 ,
• V. I. Solonin 1 ,
• V. V. Perevezentsev 1 &
• I. V. Petrov 2  

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Complex experimental studies of hydrodynamically excited vibrations of fuel-element bundles have been performed on full-scale models of VVER-440 fuel assemblies. Pressure pulsations were used as the main hydrodynamic characteristic of turbulent coolant flow according to the effect of its load on the fuel-element surfaces in the flow. Realizations of the random hydrodynamic loads causing vibrations of fuel elements are obtained on the basis of multi-point measurements of pressure pulsations along the perimeter of the outer row of the fuels elements in a bundle.

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The Effect of Spacer Grids on the Formation of Added Mass under the Bending Vibrations of a Fuel-Element Bundle in a Covered Fuel-Element Assembly of a VVER-440 Reactor

F. D. Sorokin, V. V. Perevezentsev & E. S. Krutko

Transverse Transport and Heat Transfer in Smooth VVER Fuel-Rod Bundle with Cellular Spacer Grid

P. V. Markov & V. I. Solonin

Longitudinal Displacement of a Fuel Rod Nonfixed in the Support Grid under the Conditions of Hydromechanical Vibration of VVER-440 Reactor Fuel Assemblies

V. I. Solonin & V. V. Perevezentsev

E. S. Saakov, S. I. Ryasnyi, and V. U. Khairetdinov, “Development of full-scale experiments for commissioning reactor facilities in nuclear power plants,” in: Ensuring the Safety of Nuclear Power Plants with VVER: Collection , Podolsk (2007), Vol. 2, pp. 17–23.

K. V. Frolov, N. A. Makhutov, S. M. Kaplunov, et al., Dynamics of the Structures of Hydro-Aero-Elastic Systems , Nauka, Moscow (2002).

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V. I. Solonin and V. V. Perevezentsev, “Hydrodynamically excited vibrations of a fuel-element bundle with different coolant flow characteristic at the inlet into a VVER-440 fuel assembly,” Izv. Vyssh. Uchebn. Zaved. , No. 3, 23–29 (2006).

V. V. Makarov, A. V. Afanasiev, and I. V. Matvienko, “Modal analysis of models of VVER fuel assemblies with force and kinematic excitation of vibrations,” in: Securing the Safety of Nuclear Power Plants with VVER: Collection , Podolsk (2007), Vol. 2, pp. 137–148.

V. V. Perevezentsev, V. I. Solonin, and F. D. Sorokin, “Nonstationary hydrodynamic loads and vibrations of fuel-element bundles in VVER-440 fuel assemblies,” Izv. Vyssh. Uchebn. Zaved. Yad. Energetika , No. 4, 23–29 (2008).

V. V. Perevezentsev, “Vibrations and damage to fuel elements in turbulent coolant flow in VVER fuel assembly,” Bezop. Tekhnosf. , No. 6, 11–17 (2011).

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Bauman Moscow State Technical University, Moscow, Russia

Yu. G. Dragunov, V. I. Solonin & V. V. Perevezentsev

Machine-Building Plant, Elektrostal, Moscow Oblast, Russia

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Translated from Atomnaya Énergiya, Vol. 113, No. 3, pp. 127–134, September, 2012. Original article submitted March 20, 2012.

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Dragunov, Y.G., Solonin, V.I., Perevezentsev, V.V. et al. Vibrations of fuel-element bundles in VVER fuel assemblies excited by turbulent coolant flow. At Energy 113 , 153–162 (2013). https://doi.org/10.1007/s10512-012-9610-x

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Received : 20 March 2012

Published : 21 December 2012

Issue Date : January 2013

DOI : https://doi.org/10.1007/s10512-012-9610-x

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