Apr 12, 2012

16 Types of Motorcycle Frames (on Indian Bikes)

The following information has been gathered by me over years of following motorcycles. In case of any incorrect information, please correct me/add to my knowledge..

The basic function of a motorcycle frame is somewhat similar to that of the skeleton in the human body, i.e. to hold together the different parts in one rigid structure.

One of the major benefits (for a motorcycle enthusiast) of using an advanced frame design lies in the sporty handling characteristics of the bike. A well designed frame can add to the joy of riding a motorcycle as the bike would feel more stable, effortless, confident around corners, in straight lines and while braking.

There are a variety of motorcycles frame designs out there. Each having its own Advantage (for the manufacturer) and its own Benefits (for the biker/rider). Posted below are some different types of motorcycle frame designs, their description, advantages and benefits along with the list of current Indian motorcycle models which features these frames.

1. Backbone Frame: The Hero Honda CD100 series of bikes of yore used to feature a “Backbone” frame.

Not the best frame out there for sporty handling. The design and construction of this type of frame is fairly simple though. The frame consists of a “backbone” structure that is connected to the steering. The engine is also bolted on the frame and so is the sub-frame (which supports the seats).

Advantage: Construction is simple
Benefit: For the customer, such frames don’t add much to the cost of the bike

2. Diamond Frame:

It is one of the most common type of frame found on Indian bikes. The diamond frame gets its name from the frame on a bicycle, where the shape that the frame makes is that of a diamond.

On a motorcycle there is a down tube which is attached to the steering head at one end and to the engine on the other end. Here the engine adds to the rigidity and is a “stressed member” of the chassis.

List of Indian bikes with Diamond frames are..

Bajaj: Pulsar 135LS
Hero: CBZ Xtreme, Hunk, Achiever & Karizma R/ZMR
Honda: CB Twister, CB Shine, CBF Stunner, CB Unicorn, CB Unicorn Dazzler, CBR150R, CBR250R
Royal Enfield: Bullet 350, Bullet Electra, Classic 350/500, Thunderbird 350/500
Suzuki: Slingshot, GS150R
TVS: Flame, Jive, Max 4R, Sport, Star City
Yamaha: YBR125, SS125, SZ, FZ, Fazer

Advantage: Construction is not very complex, cost savings
Benefit: Such frames are mostly light in weight

3. Cradle Frame:

Cradle frames are another one of those very common type of frames found on Indian bikes. Along with the backbone/top tube + down tube(s) these frames also have tubes which run down the engine. It’s like cradling/supporting the engine. Unlike a diamond frame, the engine is NOT a “stressed” part of the frame on this frame.

List of Indian bikes with Cradle frames are..

Bajaj: Platina 100, Discover 100/125/150, Pulsar 150/180/220, Avenger 220
Hero: CD Dawn/Deluxe, Splendor, Splendor NXG, Passion, Super Splendor, Glamour
Suzuki: (None)
TVS: Apache RTR 160/180
Yamaha: Crux, YBR110

Advantage: Construction is still simple
Benefit: Such frames probably can take abuse much better (off road/dirt bikes have cradle tubes running down their engines)

4. Trellis Frame:

Trellis frames are formed by welding pipes into a cage like arrangement. Unlike the simpler type of frames mentioned above, trellis frames do not have a backbone, down tube or cradle elements. The engine is held by the frame which kind of encircles the engine while connecting the steering head to the swing arm in the shortest way. The frames are light in weight and handling is much sportier on this type of frame.

Trellis frames are a favorite among European bike makers like KTM, Ducati. The only made in India bike with a Trellis frame currently is the KTM 200 Duke. The construction of such frames are a bit complex though as tubes have to be welded together. Such type of frame is also cost intensive.

Advantage: Apart from giving sporty handling, the frame can stand apart as a part of the bike’s styling
Benefit: Handling is sharper/sportier and the bike can be made lighter in weight

5. Perimeter Frame:

Perimeter frames also known as Twin spar/beam frames. These frames are currently the favorite among MotoGP teams. Like the trellis frames, perimeter frames connect the steering head to the swing arm in the shortest distance while the engine is suspended from the frame. The engine can be said to be held around the “perimeter” of the frame.

The only two bikes with perimeter frame currently in India are the Bajaj Pulsar 200NS and the Yamaha R15. No wonder why the R15 is so much appreciated for its handling and the Pulsar 200NS is getting rave reviews from auto publications for its handling prowess. Such frames are comparatively costly to manufacture though.

Advantage: One of the best/sportiest/advanced frames that one can put on a bike
Benefit: Race track bike like sharp and stable handling and braking

6. Monocoque Frame:

Modern cars have monocoque frame construction where the body panels form the chassis and there is no separate frame. Ducati has recently ditched their traditional trellis frame to put an innovative monocoque frame on their 1199 Panigale model. There is no separate frame constructed but the bike parts like the air-box and engine form a part of the chassis/frame.

Even prior to the 1199 Panigale such type of frame had been tried on bikes but Ducati has probably for the first time put it on a production bike. Such an innovative frame is supposed to reduce the weight of the bike considerably (which the 1199 Panigale definitely has shed) and aid in very good handling.

But in terms of handling Ducati still prefers a perimeter/twin spar frame on its MotoGP bikes. Just before the international launch of the 1199 Panigale, Ducati did try out a MotoGP bike with monocoque frame but soon switched back to the perimeter layout. The development of such a frame is currently quite complex though therefore forget about getting to see any Indian maker to experiment with such a frame.

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This is to remind that the Views or Opinions in the blog are entirely mine unless explicitly stated. The Views and Opinions published in this blog should in no way be related to any other person or organization associated -- directly or indirectly -- with me.


Anurag said...

sp, nice one…
however, i believe honda CBR150R has the perimeter frame unlike its elder sibling.
The CD100 looks funny, and is probably not the one WE had seen.

S.P - Biker Next Door said...


the frame of the CBR150R does seem to have a "Perimeter" element.. but in the official Honda website, the frame is mentioned as "Diamond" frame.. also if I remember correctly the earlier CBR150R did have a downtube along with the perimeter like elemets.

To be sure, will have to check out the frame of the CBR150R physically when it arrives in the showroom.

the CD100 (series) that was sold in India was always sold along with a leg / crash guard that use to mimic "twin downtubes".. but essentially the frame on the CD series of bikes had a backbone frame.

santosa said...

I always have a doubt about the bike frames.
thanks for wiping it today.
very informative article.

Shaiju B said...

Hey great info, a bit of surprises though!!

S.P - Biker Next Door said...

Thanks Santosa,

Thanks Shaiju.. (what's the surprises though?)

Anonymous said...

Thanks Payeng, for a very informative article.
Is 'deltabox' a synonym to perimeter frame?


P220 rider said...

Wow so informative. Payeng you rock.

Anonymous said...

cbr 150 r is expensive offers best peroformance on race track...better thn r15..

Saad Khan said...

Lovely and informative article Satadal...

S.P - Biker Next Door said...

Thanks Saad, P220 rider

scarface said...

hey its very nicely descriped with details,....thanks for the tough efforts,this will help me alott...tc bro.

utsav vyas said...

very good technical knowledge along with graphics. We easily find types of frames for cars in automobile engineering books but it is difficult to find the same for bikes.

Vijay Anand said...

Just awesome pictures, and very precise.

Anonymous said...

Very good information

Arif Ali said...

I liked...

Anonymous said...

can platina body converted like avenger?(for seat comfortable reason also handle)

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